3,4-Dihydroxy-1,2-naphthoquinone

3,4-Dihydroxyphenylglycolaldehyde

Phosphatidylinositol 3,4-bisphosphate

3,4-Methylenedioxypropiophenone

3,4-Dichloromethylphenidate

3,4-Dimethoxystyrene

Cis-3,4-dihydrophenanthrene-3,4-diol dehydrogenase

3,4-dihydroxyphthalate decarboxylase

3,4-Dimethylmethcathinone

3,4-dihydroxyphenylalanine reductive deaminase

3,4-Dihydroxymethamphetamine

3,4-Ethylenedioxythiophene

3,4-Methylenedioxyphenylpropan-2-one

3,4-Dichlorophenyl isocyanate

3,4-Dichlorophenol

Protocatechuate 3,4-dioxygenase

3,4-Dichloroaniline

3,4-Dimethoxyphenethylamine

3,4-Dihydroxyphenylacetaldehyde

Caffeate 3,4-dioxygenase

3,4-Methylenedioxyphenethylamine

3,4-Methylenedioxyphentermine

3,4-dihydroxyphenylalanine oxidative deaminase

3,4-Dihydroxystyrene

3,4-Dehydroadipyl-CoA semialdehyde dehydrogenase (NADP+)

3,4-dichloroaniline N-malonyltransferase

3,4′-Dihydroxystilbene

3,4-Dimethoxycinnamic acid

1-Hydroxycarotenoid 3,4-desaturase

3,4-Methylenedioxyamphetamine

3,4-dihydroxyphenylacetate 2,3-dioxygenase

4-chlorophenylacetate 3,4-dioxygenase

4-sulfobenzoate 3,4-dioxygenase

5-(3,4-diacetoxybut-1-ynyl)-2,2'-bithiophene deacetylase

Quercetin 3,4'-diglucoside

3,4-Dihydropyran

3,4-Methylenedioxy-N-ethylamphetamine

3,4-Methylenedioxy-N-isopropylamphetamine

Phosphatidylinositol-3,4-bisphosphate 4-phosphatase

Phytoene desaturase (3,4-didehydrolycopene-forming)

3,4-Methylenedioxy-N-methylphentermine

2,3-dihydroxybenzoate 3,4-dioxygenase

(3S,4R)-3,4-dihydroxycyclohexa-1,5-diene-1,4-dicarboxylate dehydrogenase

3,4-Divanillyltetrahydrofuran

3,4-Dihydroxybenzaldehyde

Α-Methyldopamine

3,4-Methylenedioxy-N-hydroxy-N-methylamphetamine

3,4-Difluoroamphetamine

3,4-Epoxycyclohexylmethyl-3',4'-epoxycyclohexane carboxylate

3,4-Dichloroamphetamine

3,4-Toluenedithiol

3,4-Ethylidenedioxyamphetamine

3,4-dihydroxy-2-butanone-4-phosphate synthase

3,4-dihydroxy-9,10-secoandrosta-1,3,5(10)-triene-9,17-dione 4,5-dioxygenase

3,4-Epoxycyclohexanecarboxylate methyl ester

Dimethoxyamphetamine

Methylenedioxydimethylamphetamine

TDP-4-oxo-6-deoxy-alpha-D-glucose-3,4-oxoisomerase (dTDP-3-dehydro-6-deoxy-alpha-D-glucopyranose-forming)

3,4-Methylenedioxy-N-methoxyamphetamine

3,4-Dihydroxymandelic acid

Poly(3,4-ethylenedioxythiophene)

Leucoanthocyanidin

3,4-Dihydroxyphenylacetic acid

Protocatechuic acid

O,O′-Diacetyldopamine

4-Hydroxy-7-methoxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-2-yl glucoside beta-D-glucosidase

DME (psychedelic)

Methylenedioxybenzylpiperazine

Ethyl protocatechuate

Methylenedioxycathinone

Dihydroxyphenylalanine transaminase

Ganesha (psychedelic)

3,4-Methylenedioxy-N-hydroxyamphetamine

Leucopelargonidin

Rosmarinate synthase

3-Chloro-4-fluorophenylpiperazine

3,4-MDO-U-47700

1,3-Benzodioxolylbutanamine

Methylenedioxyhydroxyethylamphetamine

L-mimosine synthase

TDP-4-oxo-6-deoxy-alpha-D-glucose-3,4-oxoisomerase

Dihydroxyphenylalanine

Protocatechuate decarboxylase

Α-Difluoromethyl-DOPA

3,4-Methylenedioxy-N-propargylamphetamine

Lignin peroxidase

Tetrahydroharman

Stizolobinate synthase

2,4,7-trihydroxy-1,4-benzoxazin-3-one-glucoside 7-O-methyltransferase

4,5-dihydroxyphthalate decarboxylase

2,4-Dihydroxy-1,4-benzoxazin-3-one-glucoside dioxygenase

Stizolobate synthase

Methylenedioxybenzylamphetamine

3,4-Methylenedioxy-N-propylamphetamine

Rosmarinic acid

Hydroxycyclohexanecarboxylate dehydrogenase

1,2-Dichloro-4-nitrobenzene

1,3-Benzodioxolyl-N-ethylpentanamine

Dihydrokaempferol 4-reductase

O,O′-Dipivaloyldopamine

TDP-4-oxo-6-deoxy-alpha-D-glucose-3,4-oxoisomerase (dTDP-3-dehydro-6-deoxy-alpha-D-galactopyranose-forming)

Hexaprenyldihydroxybenzoate methyltransferase

3,4-Bis(trifluoromethyl)-1,2-dithiete

1-Methylamino-1-(3,4-methylenedioxyphenyl)propane

Methylenedioxypyrovalerone

Caffeate O-methyltransferase

Benzoyl-CoA-dihydrodiol lyase

1,3-Benzodioxolyl-N-methylpentanamine

Putrescine N-hydroxycinnamoyltransferase

Isocitrate O-dihydroxycinnamoyltransferase

Cyclovariegatin

3-Methoxy-4-methylamphetamine

2,3-Dichlorophenylpiperazine

Homoisoflavonoid

Chlorogenic acid

Caffeic aldehyde

Methyl caffeate

Isorhapontigenin

Methylenedioxyphenylpropene

1,3-Benzodioxolyl-N-ethylbutanamine

4-Methylcatechol

6-Methoxymellein