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202.115.159.62202.115.159.62/upload/abf15195-dde4-4d52-9ede-5b40642260c3.pdf · nh2 nabh,cn , ch,oh hcch2ch2chch2ch2ch ih nmr nhch2ch3 8. ch2chch3 ( 1 ) c6hsch2coch3 (2) c6hsch2chch3
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