Used in photochemotherapy for skin disorders such as psoriasis, vitiligo, and eczema. It works by increasing the skin's sensitivity to ultraviolet light, allowing UV radiation to slow down rapid skin cell growth or stimulate pigment production. Applied topically or taken orally before UVA exposure in PUVA therapy. Also utilized in research settings for DNA crosslinking studies due to its ability to intercalate into DNA and form covalent bonds upon light activation.