glycolaldehyde

noun
gly·col·al·de·hyde | \ ˌglī-(ˌ)kȯl-ˈal-də-ˌhīd, -(ˌ)kōl- \

Medical Definition of glycolaldehyde 

: a compound that exists in solution as the diose C2H4O2 but that exists in the anhydrous state only as the crystalline dimer C4H8O4

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