Precocene 17-METHOXY-2,2-DIMETHYLCHROMENE7-Methoxy-2,2-dimethyl-3-chromenePrecocene IPRICOCENE I7-methoxy-2,2-dimethylchromene2,2-dimethyl-7-methoxy-2H-1-benzopyranPrecocene 1precocene IPrecocene I6-demethoxyageratochromene2,2-dimethyl-2H-chromen-7-yl methyl ether