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Ch2 ch2 ch ch2 ch2 nh3
Ch2 ch2 ch ch2 ch2 nh3. Nch2 ch ch3 -ch2-ch ch3. nch2 ch-ch3 [-ch2-ch-]. ch3-c-ch3-ch3-ch-c2h5-ch2-ch3. nch2=ch-ch3 -> (-ch2-ch(ch3)-)n.
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![Ch2 ch2 ch ch2 ch2 nh3. Nch2 ch ch3 -ch2-ch ch3. nch2 ch-ch3 [-ch2-ch-]. ch3-c-ch3-ch3-ch-c2h5-ch2-ch3. nch2=ch-ch3 -> (-ch2-ch(ch3)-)n.](https://avatars.mds.yandex.net/i?id=e79e61b705e21dee079e6d4e9efa0e85_l-4078046-images-thumbs&n=13 "Nch2 ch ch3 -ch2-ch ch3. nch2 ch-ch3 [-ch2-ch-]. ch3-c-ch3-ch3-ch-c2h5-ch2-ch3. nch2=ch-ch3 -> (-ch2-ch(ch3)-)n.")