protocatechualdehyde [ 3,4-dihydroxybenzaldehyde,protocatechualdehyde, 3H-labeled,protocatechualdehyde, formyl-14C-labeled,protocatechuic aldehyde,rancinamycin IV ] found in wheat grains, wheat seedlings, & other plants; RN given refers to parent cpd; see also rancinamycins; structure