A triclinic polymorph of (E)-2-(1-hy­droxy-3-phenyl­prop-2-en-1-yl­idene)-4,5-dimeth­oxy­cyclo­pent-4-ene-1,3-dione

The title compound, C16H14O5, is a triclinic polymorph of a previously reported monoclinic structure [Hosseinzadeh et al. (2011 ▶). Acta Cryst. E67, o1544]. The mol­ecule is roughly planar, the r.m.s. deviation from the least-squares plane of all non-H atoms being 0.092 Å. In the crystal, adjacent mol­ecules are linked through C—H⋯O hydrogen bonds into an infinite two-dimensional network parallel to (011). The layers are further connected via C—H⋯π inter­actions, forming a three-dimensional structure. Intra­molecular O—H⋯O and C—H⋯O hydrogen bonds are also observed

APHORPINEALKALOIDS FROM BARK OF Cryptocaryaferrea

ABSTRACT Isolation, identification and characterization of the compounds isolated from the bark of Cryptocarya ferrea yielded three known aphorpine alkaloids. They are (-)-O-methy/isopiline 1, (+)-norlirioferine 2 and ,+)":/irioferine3. Structuralelucidationwasestablishedthroughseveralspectroscopicmethods,such as 1D-NMR(H, 13C,DEPT, NOE), 2D-NMR (COSY,NOESY,HMQC, HMBC), UV, IR, and MS and comparisonwith the published data. Keywords: Cryptocaryaferrea(-)-o-methylisopiline,(+)-norlirioferine,(+)-lirioferin

Meranzin hydrate from Muraya paniculata

The coumarin ring system in the title compound, C15H18O5 [IUPAC name: 8-(2,3-dihydr­oxy-3-methyl­butyl)-7-meth­oxy-2H-1-benzopyran-2-one], isolated from Muraya paniculata, is planar (r.m.s. deviation 0.017 Å). In the crystal, the two hydr­oxy groups are involved in O—H⋯O hydrogen bonding with adjacent mol­ecules, forming a sheet structure

APHORPINE ALKALOIDS FROM BARK OF Cryptocarya ferrea

Isolation, identification and characterization of the compounds isolated from the bark of Cryptocarya ferrea yielded three known aphorpine alkaloids. They are (-)-O-methylisopiline 1, (+)-norlirioferine 2 and (+)-lirioferine 3. Structural elucidation was established through several spectroscopic methods, such as 1D-NMR (1H, 13C, DEPT, NOE), 2D-NMR (COSY, NOESY, HMQC, HMBC), UV, IR, and MS and comparison with the published data.   Keywords: Cryptocarya ferrea; (-)-o-methylisopiline, (+)-norlirioferine, (+)-lirioferin

14-Hy­droxy-8,14-secogammacera-7-ene-3,21-dione from the bark of Lansium domesticum Corr.

In the title compound (kokosanolide B), C30H48O3, the hexa­hydro- and octa­hydro­naphthalen-2-one ring systems are connected through an ethyl­ene fragment, with a C—CH2—CH2—C torsion angle of 176.2 (2)°. The cyclo­hexene ring adopts a half-chair conformation, while the other six-membered rings adopt distorted chair conformations. In the crystal, adjacent mol­ecules are linked into a zigzag chain along the b axis by O—H⋯O hydrogen bonds involving the hy­droxy and carbonyl groups

Whole-mol­ecule disordered (E)-2-(1-hy­droxy-3-phenylprop-2-en-1-yl­idene)-4,5-dimeth­oxycyclo­pent-4-ene-1,3-dione isolated from Lindera oxyphylla (Lauraceae)

In the mol­ecule of the title compound, C16H14O5, all non-H atoms are approximately co-planar [maximum atomic deviation = 0.064 (5) Å]. The hy­droxy group is a hydrogen-bond donor to a carbonyl O atom. Weak intermolecular C—H⋯O hydrogen bonding is present in the crystal structure. The crystal structure is ’whole-mol­ecule disordered’ about an axis that runs approximately along the length of the mol­ecule; the occupancy of the two disorder components was set as exactly 0.5. An intra­molecular O—-H⋯O hydrogen bond exists in each component

(20S)-24,25-Dihydr­oxy-20,24-ep­oxy-3,4-secodammar-4(28)-en-3-oic acid from Aglaia smithii

The title compound, C30H50O5, was isolated from the bark of Aglaia smithii. There are two independent mol­ecules in the asymmetric unit that differ in the orientation of the isopropenyl group attached to the cyclo­hexane ring. The cyclo­hexane rings in both mol­ecules adopt chair conformations, whereas the cyclo­pentane and tetra­hydro­furan rings adopt envelope conformations. The independent mol­ecules are linked into a layer parallel to (010) by O—H⋯O hydrogen bonds

4-(3,4-Dihydro-β-carbolin-1-yl)pyrimidin-2-amine

The mol­ecule of accanthomine A, C15H13N5, is approximately planar, with the indolyl fused-ring and the pyrimidyl ring being twisted by 31.7 (1)° The amino group of the five-membered ring is an intramolecular hydrogen-bond donor to a nitro­gen acceptor of the pyrimide ring. The amino group of the pyrimide ring is a hydrogen-bond donor to the N atoms of adjacent mol­ecules. These hydrogen-bonding inter­actions give rise to a layered network with a 4.82 topology

Kokosanolide from the seed of Lansium domesticum Corr.

In the title compound, [systematic name: 8,14-secogammacera-7,14(27)-diene-3,21-dione], C27H32O9, each of the six-membered rings adopts the common chair conformation. In the crystal, mol­ecules are linked by an O–H⋯Oester hydrogen bond into a helical chain

8,14-Secogammacera-7,14(27)-diene-3,21-dione–8,14-secogammacera-7,14-diene-3,21-dione (1.5/0.5) from the bark of Lansium domesticum Corr.

The components of the title cocrystal, 1.5C30H40O2·0.5C30H40O2, each have two tetra­hydro­deca­lin-type fused rings connected through an ethyl­ene fragment [R—CH2—CH2—R′ torsion angles: 158.1 (7) ° in the major component and 157.5 (6)° in the minor component]. The structure is a non-merohedral twin, with a minor twin component of 26%. The exocyclic double-bonded C atom of the major component of the cocrystal is disordered over two sites of equal occupancy