You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-(cyclopropylmethyl)-4-[[(1S,2R)-2-(diaminomethylideneamino)cyclohexyl]amino]-6-methylquinazoline-2-carboxamide;dihydrochloride into molecular formula.
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C21H31Cl2N7O
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