... ,5-dimethyl-8-methyleneoxireno(9,10)cyclodeca(1,2-b)furan-9(1aH)-one;Parthenolide;4Xi-germacra-1(10),11(13)-dien-12-oicacid ... ,4,5-epoxy-6.alpha.-hydroxy-,gamma-lactone;Oxireno(9,10)cyclodeca(1,2-B ... -1A,5-dimethyl-8-methylene-;Parthenlide CAS NO.:20554-84-1 Formula:C15H20O3 Formula Weight:248.32 Exterior:Brown powder Package ...