You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3R)-4-(dichloromethylidene)-3,5-dimethyl-1-phenyl-2,3-dihydro-1lambda5-phosphinine 1-oxide by IUPAC nomenclature, provide its molecular formula.
user
C14H15Cl2OP
assistant