Abstract
Four new alkaloids, tsilanine, 13, 10-methoxytsilanine, 14, O-demethyltsilanine, 15, and 10-methoxy- O-demethyltsilanine, 16, have been isolated from Strychnos henningsii. They may be distinguished from the known alkaloids of Strychnos type by the presence, in a seven-membered lactam ring, of an acetal or hemiacetal function.
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