β-methylcrotonylglycinuria

β-meth·yl·cro·to·nyl·gly·cin·u·ria (meth″əl-kro″to-nəl-gli″sĭ-nuґre-ə) 3-methylcrotonyl CoA carboxylase deficiency. 2. excretion of 3-methylcrotonylglycine in the urine, as occurs in 3-methylcrotonyl CoA carboxylase deficiency or multiple carboxylase deficiency.