padimate o padimate o padimate o is an organic compound related to the water-soluble compound paba (4-aminobenzoic acid) that is used as an ingredient in some sunscreens. this yellowish water-insoluble oily liquid is an ester formed by the condensation of 2-ethylhexanol with dimethylaminobenzoic acid. other names for padimate o include 2-ethylhexyl 4-dimethylaminobenzoate, escalol 507, octyldimethyl paba, and od-paba. padimate o names iupac name 2-ethylhexyl 4-(dimethylamino)benzoate other names 2-ethylhexyl dimethyl pabaescalol 507sundown identifiers cas number 21245-02-3 y 3d model (jsmol) interactive image chemspider 28343 y echa infocard 100.040.248 kegg d05335 y pubchem cid 30541 unii z11006cmuz y comptox dashboard (epa) dtxsid7029320 inchi inchi=1s/c17h27no2/c1-5-7-8-14(6-2)13-20-17(19)15-9-11-16(12-10-15)18(3)4/h9-12,14h,5-8,13h2,1-4h3 ykey: wywzrnahinyaef-uhfffaoysa-n yinchi=1/c17h27no2/c1-5-7-8-14(6-2)13-20-17(19)15-9-11-16(12-10-15)18(3)4/h9-12,14h,5-8,13h2,1-4h3key: wywzrnahinyaef-uhfffaoyal smiles o=c(occ(cc)cccc)c1ccc(n(c)c)cc1 properties chemical formula c17h27no2 molar mass 277.408 g·mol−1 density 0.99 g/cm3 melting point <25 °c boiling point 362 °c (684 °f; 635 k) hazards nfpa 704 (fire diamond) 1 1 0 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). y verify (what is yn ?) infobox references photobiology padimate o absorbs ultraviolet rays, thereby preventing direct dna damage by uv-b. however, the thus-excited padimate o molecule may then react with dna to produce indirect dna damage, similar to the effects of ionizing radiation. an in vitro yeast study conducted in 1993 demonstrated the sunlight-induced mutagenicity of padimate o. the photobiological properties of padimate o resemble those of michler's ketone, which is considered photocarcinogenic in rats and mice. these findings suggest that padimate o might also be photocarcinogenic. however, multiple in vivo studies conducted in hairless mice following topical application of padimate o have demonstrated no carcinogenic effects and that padimate o reduces the number of and delays the appearance of uv-induced skin tumors.