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 (1R,12S,14S,19S)-15-thia-4,9,13-triazaheptacyclo[12.6.1.13,7.01,16.02,12.04,19.010,22]docosa-2,7,10(22),16-tetraene-11,18-dione .
user
C18H15N3O2S
assistant