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'Soured' means: lactic acid is (microbiologically) formed out of lactose:

(THIS is a chemical change)

C12H22O11 --> (among other compounds) C3H6O3

by anaerobic homofermentative Lactobacillus spp.

IUPAC name: 2-hydroxypropanoic acid = lactic acid = CH3CHOHCOOH

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