1.14.13.113	FAD-dependent urate hydroxylase	urate conversion to allantoin II	
3.5.2.17	hydroxyisourate hydrolase	urate conversion to allantoin II	
4.1.1.97	2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline decarboxylase	urate conversion to allantoin II