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 (7S,8S)-7-oxo-7,8-diphenyl-5,10-dithia-7lambda5-phosphatricyclo[7.3.0.02,6]dodeca-1(9),2(6),3,11-tetraen-8-ol .
user
C21H15O2PS2
assistant