12-Nitromethyl-14-deoxyandrographolide

In the molecule of the title compound {systematic name: 3-[2-(6-hydroxy-5-hydroxymethyl-5,8a-dimethyl-2-methyleneperhydro-1-napthyl)-1-(nitromethyl)ethyl]-2(4H)-furanone}, C21H31NO6, the cyclohexane rings have chair conformations. Intramolecular O—H⋯O hydrogen bonding results in the formation of a six-membered non-planar ring with a twist conformation. In the crystal structure, intermolecular O—H⋯O hydrogen bonds link the molecules into infinite chains along the c axis.