`O_(2)N-underset((P))CH_(2)-overset(O)overset(||)C-OH` `Me_(3)overset(o+)N-underset((Q))CH_(2)-overset(O)overset(||)C-OH` `NC-CH_(2)underset((R))-over
`O_(2)N-underset((P))CH_(2)-overset(O)overset(||)C-OH`
`Me_(3)overset(o+)N-underset((Q))CH_(2)-overset(O)overset(||)C-OH`
`NC-CH_(2)underset((R))-overset(O)overset(||)C-OH`
`HO-overset(O)overset(||)Cunderset((S))-overset(O)overset(||)C-OH:`
A. `QgtRgtPgtS`
B. `RgtQgtPgtS`
C. `SgtQgtPgtR`
D. `SgtRgtQgtP`
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