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Pronunciation varies by accent · noun
(organic chemistry) protocatechuic aldehyde.
Use protocatechualdehyde when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Protocatechualdehyde means (organic chemistry) protocatechuic aldehyde.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use protocatechualdehyde where its definition matches the intended context.
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