5.3.3.1	steroid DELTA-isomerase	-	
5.3.3.10	5-carboxymethyl-2-hydroxymuconate DELTA-isomerase	-	
5.3.3.11	isopiperitenone DELTA-isomerase	-	
5.3.3.12	L-dopachrome isomerase	-	
5.3.3.13	polyenoic fatty acid isomerase	-	
5.3.3.14	trans-2-decenoyl-[acyl-carrier protein] isomerase	-	
5.3.3.15	ascopyrone tautomerase	transferred, now EC 5.3.2.7	
5.3.3.16	4-oxalomesaconate tautomerase	transferred, now EC 5.3.2.8	
5.3.3.17	trans-2,3-dihydro-3-hydroxyanthranilate isomerase	-	
5.3.3.18	2-(1,2-epoxy-1,2-dihydrophenyl)acetyl-CoA isomerase	-	
5.3.3.19	3-[(4R)-4-hydroxycyclohexa-1,5-dien-1-yl]-2-oxopropanoate isomerase	-	
5.3.3.2	isopentenyl-diphosphate DELTA-isomerase	-	
5.3.3.20	2-hydroxyisobutanoyl-CoA mutase	transferred to EC 5.4.99.64	
5.3.3.21	DELTA3,5-DELTA2,4-dienoyl-CoA isomerase	-	
5.3.3.22	lutein isomerase	-	
5.3.3.23	S-methyl-5-thioribulose 1-phosphate isomerase	-	
5.3.3.3	vinylacetyl-CoA DELTA-isomerase	-	
5.3.3.4	muconolactone DELTA-isomerase	-	
5.3.3.5	cholestenol DELTA-isomerase	-	
5.3.3.6	methylitaconate DELTA-isomerase	-	
5.3.3.7	aconitate DELTA-isomerase	-	
5.3.3.8	DELTA3-DELTA2-enoyl-CoA isomerase	-	
5.3.3.9	prostaglandin-A1 DELTA-isomerase	-	
5.3.3.B2	linoleate (10E,12Z)-isomerase	preliminary BRENDA-supplied EC number