Escitalopram is the active (S)-enantiomer of citalopram, belonging to the selective serotonin reuptake inhibitor (SSRI) class. As a specialty chemical and active pharmaceutical ingredient (API), it is used in the synthesis and formulation of medications for treating major depressive disorder, generalized anxiety disorder, panic disorder, social anxiety disorder, and obsessive-compulsive disorder. It functions by selectively inhibiting serotonin reuptake, thereby increasing serotonin levels in the brain to improve mood and reduce anxiety symptoms. This product is supplied as a colourless to pale yellow thick oil with a purity of ≥97.5%, confirmed by infrared spectrum and NMR conforming to structure. It is intended for pharmaceutical research, development, or manufacturing under controlled conditions.