?url_ver=Z39.88-2004&rft_id=10.1021%2Fjo049873s&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Rivkin%2C+A&rft.aulast=Rivkin&rft.aufirst=A&rft.issue=11&rft.volume=69&rft.date=28+May+2004&rft.issn=0022-3263&rft.atitle=Radical+and+palladium-catalyzed+cyclizations+to+cyclobutenes%3A+An+entry+to+the+BCD+ring+system+of+penitrem+D&rft.title=Journal+of+Organic+Chemistry&rft.pages=3719+-+3725&rft.genre=article