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A major insecticidal constituent of Ryania speciosa is isolated and characterized by n.m.r. and mass spectroscopy as the new alkaloid 9, 21-didehydroryanodine (2); reduction of (2) with hydrogen (or tritium)gas yields both ryanodine (1) and 9-epiryanodine (3)(or their 9,21-3H analogues) in a 1:9 ratio.
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Waterhouse et al. (1984) studied this question.
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