Avocettin

Koningic acid

heptelidic acid

(5aS,9S)-1,5aβ,6,7,8,9aα-Hexahydro-6β-isopropyl-1-oxospiro[2-benzoxepine-9(3H),2'-oxirane]-4-carboxylic acid

(5aS,9S)-1,5a,6,7,8,9aα-Hexahydro-6β-(1-methylethyl)-1-oxospiro[2-benzoxepine-9(3H),2'-oxirane]-4-carboxylic acid