You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-(1,3,4,6,7,8,9,9a-octahydropyrido[1,2-a]pyrazin-2-yl)-8-phenyl-5,6,7,8-tetrahydroquinazolin-2-amine into molecular formula.
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C22H29N5
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