Solanopubamine, a rare steroidal alkaloid from Solanum schimperianum: Synthesis of some new alkyl and acyl derivatives, their anticancer and antimicrobial evaluation - Al-Rehailya, A J; Ahmada, M S; Mustafaa, J; Al-Oqaila, M M; Hassana, W H; Khanb, S I; Khana, I A (J Saudi Chem Soc, 2013)