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 1-[4-(dimethylamino)phenyl]-3-[[(2R,4S,5S)-5-ethynyl-1-azabicyclo[2.2.2]octan-2-yl]methyl]thiourea .
user
C19H26N4S
assistant