Crystal structure of obscurine: a natural product isolated from the stem bark of B. obscura

The title compound, C(24)H(31)NO(3) {systematic name: (E)-3-[(1R*,2S*,4aS*,8aR*)-2-(benzo[d][1,3]dioxol-5-yl)-1,2,4a,5,6,7,8,8a-octa­hydro­naphthalen-1-yl]-N-iso­butyl­acryl­amide}, is a natural product isolated from the stem bark of B. obscura. It is composed of an octa­hydro­naphthalene ring system substituted with an essentially planar benzodioxole ring system [r.m.s. deviation = 0.012 Å] and an extended iso­butyl­acryl­amide group. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming chains propagating along [100]. The chains are linked by pairs of C—H⋯O hydrogen bonds, involving inversion-related benzodioxole ring systems, forming ribbons lying parallel to (010). There are also C—H⋯π inter­actions present within the ribbons.