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

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

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

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