CREATE TABLE table_name_30 (abb VARCHAR2, disorder VARCHAR2)

What is the abbreviation of the enzyme involved in carbamoyl phosphate synthetase i deficiency?
SELECT abb FROM table_name_30 WHERE disorder = "carbamoyl phosphate synthetase i deficiency"
SELECT "abb" FROM "table_name_30" WHERE "carbamoyl phosphate synthetase i deficiency" = "disorder"