You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 6-amino-4-(2,5-dimethoxyphenyl)-3-(4-fluorophenyl)-1,2,3,3a,4,7a-hexahydropyrano[2,3-c]pyrazole-5-carbonitrile .
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C21H21FN4O3
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