A new alkaloid, 15-b-stemmadenine, was isolated from the fruits of Tabernaemontana heyneana Wall. from the ethanolic extract. The complete 1 H and 13 C NMR assignments of the compound were carried out using COSY, HMQC and HMBC. Stereochemistry at C-15 and C-16 was established using ROESY and temperaturedependent 1 H NMR studies.
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