Formal total synthesis of the cytotoxic marine ascidian alkaloid haouamine A. Journal   Organic letters. Citation   Org Lett. 8(11):2309-12 Publication date   2006 May 25 Authors   Jeong JH Weinreb SM Grant agencies   National Cancer Institute National Institute of General Medical Sciences Grants   NCI CA-34303 NIGMS GM-32299 Abstract   [reaction: see text] Described is a convergent 13-step synthesis of a pentacyclic compound which has previously been transformed into haouamine A, therefore constituting a formal total synthesis of this unique marine alkaloid.