You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (6S,9S)-6-methyl-9-(4-propoxyphenyl)-5,6,7,9-tetrahydro-4H-[1,2,4]triazolo[5,1-b]quinazolin-8-one ?
user
C19H22N4O2
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