You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,3aS,5aR,5bR,7aR,9R,11aR,11bR,13aS,13bR)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-1-prop-1-en-2-yl-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysene-3a-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H48O3
assistant