| 摘要 |
Sunscreens for application to the skin are salts of naturally occurring cinnamic acid derivatives (especially chlorogenic acid) with (preferably naturally occurring) bases such as caffeine, theophylline or cocaine. Sunscreens for skin application comprise compounds of formula (I): R1 - R5 = H, OH or 1 - 20C alkoxy; ring 1 = an aromatic ring; ring 2 = a ring with 0, 1 or 2 double bonds or can also be an aromatic ring; and X = a base
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