Abietospiran

(23S,25R)-23-Hydroxy-3α-methoxy-17,23-epoxy-9β,19-cyclolanostane-26-oic acid γ-lactone

(23S,25R)-17,23-Epoxy-23-hydroxy-3α-methoxy-9β,19-cyclo-5α-lanostan-26-oic acid γ-lactone