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 methyl-[[(1S)-5-methyl-9-oxo-10-phenylmethoxy-4,5,8,10-tetrazatricyclo[6.2.1.02,6]undeca-2(6),3-dien-7-yl]methyl]carbamic acid .
user
C18H21N5O4
assistant