Clavicipitic acid, an amphoteric indole derivative from Claviceps fusiformis, is identified by mass spectral and 1H n.m.r. studies as 3,4,5,6-tetrahydro-6-(2-methylprop-1-enyl)-1H-azepino[5.4,3-cd]indole-4-carboxylic acid (4) and shown to exist in two diastereoisomeric forms.
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King et al. (1977) studied this question.
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