(13)Cytochalasa-5,13,21-triene-1,7,23-trione, 16-methyl-10-phenyl-, (13E,16R,21E)- 16-Methyl-10-phenyl-(13)-cytochalasa-5(6),13,21-trien-1,7,23-trione 52212-93-8 Protophomine