The assay tests the inhibition of ALDH1A1 activity using propionaldehyde as an electron donor and NAD+ as an electron acceptor. The conversion of NAD+ to NADH is measured via an increase in fluorescence intensity to determine enzyme activity. ALDH1A1 plays critical roles in the metabolic activation of retinoic acid and may be a target for inhibitor development in metabolic diseases. Is the molecule effective to this assay?