You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (5R)-5-hydroxy-1-methoxy-5-methyl-4a,6,7,8-tetrahydro-2H-naphthalene-2-carboxylic acid using the IUPAC nomenclature.
user
C13H18O4
assistant