You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
S-[(2S,3S,5S)-2-(6,8-dimethyl-2H-purin-2-id-9-yl)-4-methoxy-5-(methoxymethyl)oxolan-3-yl] ethanethioate;9-[(3R,5S)-4-methoxy-5-(methoxymethyl)-3-methyloxolan-3-yl]-6,8-dimethyl-2H-purin-2-ide;9-[(2S,5S)-4-methoxy-5-(methoxymethyl)oxolan-2-yl]-6,8-dimethyl-2H-purin-2-ide;yttrium is the IUPAC name of a molecule. Please give its molecular formula.
user
C45H61N12O10SY3-3
assistant