阿伏苯宗 (英语：Avobenzone,商品名: Parsol 1789, Eusolex 9020, Escalol 517 等。INCI名称:Butyl Methoxydibenzoylmethane) 阿伏苯宗为USAN名称。为一使用于防晒产品中的脂溶性成分，能够吸收所有波段的 UVA(约 315至400奈米)，是二苯甲酰甲烷(DBM)的衍生物。其中，阿伏苯宗对于波长 357奈米的 UVA吸收率最高。

因为相较于其他化学防晒剂它能够吸收相当大范围波段的紫外光，因此被广泛地使用于许多标榜广谱防晒产品中。

Avobenzone (trade names Parsol 1789, Milestab 1789, Eusolex 9020, Escalol 517, Neo Heliopan 357 and others, INCI Butyl Methoxydibenzoylmethane) is an oil-soluble ingredient used in sunscreen products to absorb the full spectrum of UVA rays. It is a dibenzoylmethane derivative. Avobenzone exists in the ground state as a mixture of the enol and keto forms, favoring the chelated enol. This enol form is stabilized by intramolecular hydrogen-bonding within the β-diketone. Its ability to absorb ultraviolet light over a wider range of wavelengths than many other sunscreen agents has led to its use in many commercial preparations marketed as "broad spectrum" sunscreens. Avobenzone has an absorption maximum of 357 nm.