phosphoglyceric acid
noun
phos·pho·gly·cer·ic acid
ˌfäs-(ˌ)fō-gli-ˈser-ik-
: either of two isomeric acid phosphates C3H5O3(OPO3H2) of glyceric acid that are formed as intermediates in photosynthesis and in carbohydrate metabolism
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Merriam-Webster unabridged
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