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℅. O=C-C=N. C'N'C. C K-2 N.
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C 90
1 c 8
Ab c
C реакции
8 c 5
Вектор c
C можно
Дано c
C 5 d c d
C ключи
℅. O=C-C=N. C'N'C. C K-2 N.