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-butyl-2-hydroxy-9-[[5-(4-methoxyphenyl)thiophen-2-yl]methyl]-3-(2-methylpropyl)-1,4,9-triazaspiro[5.5]undecan-5-one .
user
C28H41N3O3S
assistant