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[求助] ChemSketch生成的InChI存在问号的情况

大家好,

请教我用ChemSketch绘制完一个化学结构图,结构中有手性分子,然后想生成InChI,发现InChI 式子中存在一些“问号”,请问是怎么回事?

如下:InChI=1/C24H44O2Si2/c1-24-15-14-20-19-11-9-18(25-27(2,3)4)16-17(19)8-10-21(20)22(24)12-13-23(24)26-28(5,6)7/h13,17-22H,8-12,14-16H2,1-7H3/t17-,18+,19-,20+,21+,22?,24+/m0/s1

如果没有添加手性分子,InChI如下: InChI=1/C24H46O2Si2/c1-24-15-14-20-19-11-9-18(25-27(2,3)4)16-17(19)8-10-21(20)22(24)12-13-23(24)26-28(5,6)7/h17-23H,8-16H2,1-7H3

提前感谢
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