One further example is flavopiridol
(6; Scheme 1) (section 5.5.1). Though it is totally
synthetic, the basis for its novel structure is a natural product,
rohitukine (7; Scheme 1), isolated by chemists at Hoechst
India Ltd. in the early 1990s from Dysoxylum binectariferum
Hook. f., which is phylogenetically related to the Ayurvedic
plant, D. malabaricum Bedd