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 3-[(5R,6R)-1-azabicyclo[3.2.1]octan-6-yl]-4-[(3R)-4-methyl-1-phenylpent-1-yn-3-yl]oxy-1,2,5-thiadiazole .
user
C21H25N3OS
assistant