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Structure 1 has been elucidated for chaenorhine, an alkaloid isolated from Chaenorhinum organifolium (Scrophulariaceae). The key derivative for the structural elucidation is 13,14,21,22‐tetrahydro‐21,22‐seco‐chaenorhine (21). 21 gave upon hydrolysis spermine and 4‐hydroxydihydrocinnamic acid characterized as the tetraacetyl derivative 18 and as the dimethyl derivative respectively.
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Bernhard et al. (1973) studied this question.
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