L-티로신은 Levodopa EP Impurity B 및 Phenylalanine EP Impurity C로도 표기되는 방향족 아미노산으로, 4-하이드록시-L-페닐알라닌에 해당한다. CAS 60-18-4, 분자식 C9H11NO3, 분자량 181.07 g/mol이다. 구조적으로는 페닐알라닌 골격의 para-하이드록실화 유도체이며, 생합성 및 분해 경로에서 카테콜아민 전구체와 밀접하게 연결된다. 약전 맥락에서는 레보도파 및 페닐알라닌 제조 공정에서의 불완전 전환, 가수분해, 산화 반응으로 생성되는 공정 관련 불순물로 관찰될 수 있다. 검출과 정량에는 LC-MS/MS, LC-UV가 일반적이며, 극미량 수준에서는 HRMS 또는 키랄 LC가 요구된다.
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