Precocene 17-METHOXY-2,2-DIMETHYLCHROMENE7-Methoxy-2,2-dimethyl-3-chromenePrecocene I6-demethoxyageratochromeneprecocene I2,2-dimethyl-7-methoxy-2H-1-benzopyranPrecocene 1Precocene I7-methoxy-2,2-dimethylchromenePRICOCENE I2,2-dimethyl-2H-chromen-7-yl methyl ether