这篇文献J Chem Soc Perkin Trans,49 (1993),pp.1373–1377该去哪个数据库下载?Y.H. Lai, A.H. YapSynthesis and rigid conformers of 14,15-dimethyl-2,11-dithia[3.3](1,3)(l,4)cyclophane and 12,13-dimethyl[2.2](1,3)(1,4)cyclophaneJ Chem Soc Perk
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