Abstract
Urinary metabolites of sinomenine were investigated in rats after intragastric administration. Three major metabolites were obtained and characterised as 4-hydroxy-3,7,7-trimethoxy-17-methyl-(9α,13α,14α)-morphinan-6-one (1), 7,8-didehydro-4-hydroxy-3,7-dimethoxy-17-methyl-N-oxide-(9α,13α,14α)-morphinan-6-one (2), and 7,8-didehydro-4-hydroxy-3,7-dimethoxy-(9α,13α,14α)-morphinan-6-one (3). Their structures have been elucidated on the base of spectral analysis, among which 1 and 2 were new compounds.
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Acknowledgements
Special thanks are extended to Professor Lijun Wu for his warm-hearted suggestion on the structure elucidation.