Padimate A

Padimate A is an organic compound that is an ingredient in some sunscreens. It is a dimethyl ester derivative of PABA. This aromatic chemical absorbs ultraviolet rays thereby preventing sunburn. However, its chemical structure and behaviour is similar to an industrial free radical generator.^[1] In Europe this chemical was withdrawn in 1989 for unstated reasons.^[1] In the US it was never approved for use in sunscreens.

Padimate A

Names
Preferred IUPAC name 3-Methylbutyl 4-(dimethylamino)benzoate
Other names isoamyl dimethyl PABA Escalol 506, 4-dimethylaminobenzoic acid isopentyl ester
Identifiers
CAS Number	21245-01-2 Y
3D model (JSmol)	Interactive image
ChemSpider	80159 N
ECHA InfoCard	100.040.247
PubChem CID	88836
UNII	956679A27P Y
CompTox Dashboard (EPA)	DTXSID3046580
InChI InChI=1S/C14H21NO2/c1-11(2)9-10-17-14(16)12-5-7-13(8-6-12)15(3)4/h5-8,11H,9-10H2,1-4H3 N Key: OFSAUHSCHWRZKM-UHFFFAOYSA-N N InChI=1/C14H21NO2/c1-11(2)9-10-17-14(16)12-5-7-13(8-6-12)15(3)4/h5-8,11H,9-10H2,1-4H3 Key: OFSAUHSCHWRZKM-UHFFFAOYAM
SMILES CC(C)CCOC(=O)c1ccc(cc1)N(C)C
Properties
Chemical formula	C14H21NO2
Molar mass	235.322
Melting point	<25 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Photobiology

The photobiological properties of padimate O and padimate A resemble that of Michler's ketone. These compounds have been shown to increase the lethal effects of UV-radiation on cells.^[1] This photochemistry is relevant to the sunscreen controversy.

See also

• Padimate O, a related sunscreen ingredient