You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2-morpholin-4-yl-5,7-dihydropyrrolo[3,4-d]pyrimidin-6-yl)-2-thiophen-2-ylethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H18N4O2S
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