16989-99-4

(3z,4as,4br,6as,9z,10as,10bs,12as)-3,9-bis(hydroxymethylidene)-10a,12a-dimethyl-4a,4b,5,6,6a,7,10,10b,11,12-decahydro-4h-naphtho[2,1-f]chromene-2,8-dione