You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(8R)-8-(4-chlorophenyl)-3,7-bis(3,4-dimethylphenyl)-2,4,6,8-tetrahydropyrimido[6,1-b][1,3,5]thiadiazine-9-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H29ClN4S
assistant