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 2-[(2-chlorophenyl)methyl]-8-(4-methoxyphenyl)-7,8a-dihydro-6H-imidazo[2,1-c][1,2,4]triazin-2-ium-3,4-dione ?
user
C19H18ClN4O3+
assistant