?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.bmc.2006.05.073&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Tangirala%2C+RS&rft.aulast=Tangirala&rft.aufirst=RS&rft.issue=18&rft.volume=14&rft.date=15+September+2006&rft.issn=0968-0896&rft.atitle=Synthesis+and+biological+assays+of+E-ring+analogs+of+camptothecin+and+homocamptothecin&rft.title=Bioorganic+and+Medicinal+Chemistry&rft.pages=6202+-+6212&rft.genre=article