coronafacic acid

(3aS)-6α-Ethyl-2,3,3aβ,6,7,7aβ-hexahydro-1-oxo-1H-indene-4-carboxylic acid

(3aS)-2,3,3aβ,6,7,7aβ-Hexahydro-1-oxo-6α-ethyl-1H-indene-4-carboxylic acid

(3aS)-1-Oxo-6α-ethyl-2,3,3aβ,6,7,7aβ-hexahydro-1H-indene-4-carboxylic acid