Benzophenone-n explained

Benzphenone-1 – benzophenone-12 (BP-1 –BP-12) are UVA/UVB absorbers. Some of them are used in sunscreens.

Benzophenone-1 (2,4-dihydroxybenzophenone)
Benzophenone-2 (2,2',4,4'-tetrahydroxybenzophenone)
Benzophenone-6 (2,2'-dihydroxy-4,4'-dimethoxybenzophenone)
Benzophenone-7 (5-chloro-2-hydroxybenzophenone)
Benzophenone-9 (sodium 2,2'-dihydroxy-4,4'-dimethoxybenzophenone-5,5'-disulfonate)
Benzophenone-11 (benzophenone-2 and benzophenone-6)^[1]

References