Four new eremophilane-type sesquiterpenes, petasones A (1) and B (2), S-petasitin (3), and petasinol (4), were isolated from the aerial parts of Petasites formosanus. Their structures were elucidated by spectroscopic and chemical methods as 3alpha-[(Z)-3-methylsulfinylacryloxy]eremophila-7(11), 9-dien-8-one; 3alpha-[(E)-3-methylsulfinylacryloxy]eremophila-7(11), 9-dien-8-one; 3alpha-[(Z)-3-methylthioacryloxy]-11-hydroxyeremophila -6, 9-dien-8-one; and 3alpha-[(E)-3-methylsulfinylacryloxy]-8beta-hydroxy eremophila-9, 11-diene, respectively.
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Lin et al. (1998) studied this question.
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