You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,4R,5R)-5-amino-2-[[(2R,3R,5R)-5-(4-amino-2-oxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
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C18H29N4O15P
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