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Report a problem related to object: Синтез новых производных пирано(тиопирано)- [4՛,3՛: 4,5]пиридо[2,3-b] тиено[3,2-d]пиримидинов и пиримидо[5՛,4՛: 2,3] тиено[2,3-c]изохинолинов