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In the title compound, C(19)H(21)NO(4), the dihydro-pyridine ring adopts a distorted screw-boat conformation. The fused cyclo-hexenone ring forms a slightly distorted envelope conformation. The dihedral angle between the mean planes of the benzene and heterocyclic rings is 86.1 (7)°. An intra-molecular C-H⋯O inter-action occurs. In the crystal, mol-ecules… (More)
The title compound, C(24)H(32)O(5)·C(2)H(4)O(2), is a derivative of abietic acid. The two fused and unbridged cyclo-hexane rings have chair conformations and the anhydride ring is planar. Of the other three six-membered rings, two have boat conformations and one has a twist-boat conformation. The crystal structure is stabilized by inter-molecular O-H⋯O and… (More)
The title compound, C(26)H(38)O(6)·H(2)O, is a mono-ester of a derivative of maleopimaric acid, an abietic-type acid. The two fused and unbridged cyclo-hexane rings adopt approximate chair conformations while the three other three six-membered rings have boat conformations.