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 2-(20-oxa-9-thiapentacyclo[11.7.0.02,10.03,8.014,19]icosa-1(13),2(10),3,5,7,11,14(19),15,17-nonaen-18-yl)-4-propan-2-ylpyridine .
user
C26H19NOS
assistant