You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-1-[(2R)-4-[6-(ethylcarbamoylamino)purin-9-yl]-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carbonyl]pyrrolidine-2-carboxylic acid;(2R)-1-[(2R)-4-[6-(ethylcarbamoylamino)purin-9-yl]-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carbonyl]pyrrolidine-2-carboxylic acid;(2S)-1-[(2S)-4-[6-(ethylcarbamoylamino)purin-9-yl]-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carbonyl]pyrrolidine-2-carboxylic acid;(2R)-1-[(2S)-4-[6-(ethylcarbamoylamino)purin-9-yl]-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carbonyl]pyrrolidine-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C100H108N28O28
assistant