The heartwood of Azadirachta indica (Meliaceae) yielded a new steroid (2\alpha, 3\beta, 4\beta-trihydroxypregnan-16-one) and 2 known steroids (2\beta, 3\beta, 4\beta-trihydroxypregnan-16-one and 2\alpha, 3\alpha, 4\beta-trihydroxypregnan-16-one). Their structures were elucidated through spectral studies including 2D NMR (COSY, NOESY, J-resolved, HMQC, HMBC) experiments.
SIDDIQUI, BINA SHAHEEN; ALI, SYED KASHIF; ALI, SYED TARIQ; and AHMED, FAYYAZ
"Pregnane steroids from the heartwood of Azadirachta indica,"
Turkish Journal of Chemistry: Vol. 33:
4, Article 7.
Available at: https://journals.tubitak.gov.tr/chem/vol33/iss4/7