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Phosphoric acid can form mono-, di-, and triesters. Diesters of phosphoric acid are part of the backbone of RNA and DNA. Identify the condensed structural formula of the dimethyl ester of phosphoric acid.

a) O=P(OH)(OMe)2
b) O=P(OMe)3
c) O=P(OH)2(OMe)
d) O=P(OH)3

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