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The stereochemistry (e. vitamin c 500 mg untuk ibu hamil g R or S) is very crucial in determining whether it is a meso compound or not As mentioned above, a meso compound is optically inactive, so their stereochemistry should cancel out For instance, R cancels S out in a meso compound with two stereocenters trans-1,2-dichloro-1,2-ethanediol (meso)-2,3-dibromobutane