Table 3.

Labdane diterpenoids isolated from Aristolochia species.

Clerodane	Species
(5R,8R,9S,10S)-ent-Labdan-8β-hydroxy-15-oic acid (57)	A. galeata [40]
(5R,8R,9S,10S)-ent-Labd-13-en-8β-hydroxy-15-oic acid [Δ13,14-ent-labd-8β-ol-15-oic acid] (58)	A. galeata [40]
(5R,8R,9S,10S)-ent-Labd-14-en-8β-ol (60)	A. cymbifera [40]
(5S,8R,9R,10R)-ent-Labd-14-en-8β,13α-diol (61)	not isolated from Aristolochia species [54]
(5R,9S,10S)-ent-Labd-8(17)-en-15-oic acid (62)	A. ringens [55]
(5R,9S,10S)-ent-Labd-8(17),13-dien-15-oic acid [copalic acid] (63)	A. esperanzae [40]; A. galeata [40]
(5R,9S,10S)-ent-Labd-6β-hydroxy-8(17),13-dien-15-oic acid (64)	A. esperanzae [40]
Methyl (5R,8R,9S,10S)-ent-labd-8(17),13-dien-15-oate [methyl copalate] (65)	A. esperanzae [40]
Methyl (5R,9S,10S)-ent-labd-6β-hydroxy-8(17),13-dien-15-oate (66)	A. esperanzae [40]
(5R,10S)-ent-Labd-8,14-diene (67)	A. cymbifera [40]

Usual names are given in brackets