Given the structure of D-glyceraldehyde, how would you assign a structure to each of the two aldoses obtained from it by Eq. 24.55, assuming that these compounds were previously unknown?

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H CH O -OH Kiliani-Fischer CH₂OH D-(+)-glyceraldehyde (absolute configuration assumed by convention) H H- CH O -OH -OH + HO- H CH O CH₂OH D-(-)-erythrose (configurations at carbon-3 assumed by convention) -H -OH CH₂OH D-(-)-threose (24.55)