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 methyl (1S,4aS,8aR)-1-(2-ethoxyphenyl)-4a-hydroxy-1,3,4,5,6,7,8,8a-octahydroisoquinoline-2-carboxylate .
user
C19H27NO4
assistant