Barbascoic acid

(2R)-2α-(3-Furyl)-1,4,4aβ,5,6,6a,9,10,10aβ,10b-decahydro-6aα,10bα-dimethyl-4-oxo-2H-naphtho[2,1-c]pyran-7-carboxylic acid

(2R)-2α-(Furan-3-yl)-4-oxo-6aα,10bα-dimethyl-1,2,4aβ,5,6,6a,9,10,10aβ,10b-decahydro-4H-naphtho[2,1-c]pyran-7-carboxylic acid