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| ● 急求化学文献 | ● Paper Help, TL 1977, Thanks | | ● 求文献（两个包子） | ● paper help, TL 1984, thanks | | ● 求文献，谢谢！ | ● two paper help with link thank you | | ● help for paper from Tetrahedron Letters (paper in press)-_T | ● literature help! link provided! thanks | | ● paper help | ● paper help, thanks | | ● Paper help, thanks! | ● paper help tetrahedron letters, 1993, 34, 3737 | | ● paper help | ● paper help TL 1992, 33, 2279-2282 | | ● Paper Help, TL 1989, thanks | ● paper help |
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