protocatechualdehyde
noun
pro·to·catechualdehyde
variants
or protocatechuic aldehyde
"+¦katə¦chüik,
-¦shüik,
-¦kyüik-
: a crystalline compound C6H3(OH)2CHO which is synthetically prepared and the monomethyl ether of which is vanillin; 3,4-dihydroxy-benzaldehyde
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Merriam-Webster unabridged
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