Crystal structure of (1SR,8RS,15SR,19RS)4,6-dimethoxy-17-methyl-3,5-diazapentacyclo[6.6.5.02,7.09,14.015,19]-nonadec-2,4,6,9,11,13-hexaene-16,18-dione, C19H17N3O4, the major adduct from the Diels-Alder reaction of maleic anhydride with 2,4-dimethoxy-1,3-diazaanthracene

Abstract

The H atoms were placed in their geometrically calculated positions and included in the final refinement in the riding model approximation