Two azulenes produced by the liverwort, Calypogeia azurea, during in vitro culture
1992
Nakagawara, S. | Katoh, K. | Kusumi, T. | Komura, H. | Nomoto, K. | Konno, H. | Huneck, S. | Takeda, R.
Two new sesquiterpenoids, 4-methylazulene-1-carbaldehyde and 4-methylazulene-1-carboxylic acid, were isolated from cultures of Calypogeia azurea. Their structures were established by spectroscopic analysis. The sodium salt of 4-methylazulene-1-carboxylic acid was a naturally occurring water-soluble azulene that displayed anti-inflammatory and anti-ulcer activity.
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