You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1-cyclopropylpyrrolidin-3-yl)-2-(6,7-dihydro-5H-pyrrolo[2,1-c][1,2,4]triazol-3-ylmethyl)-3-ethylguanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H27N7
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