6 components: 1000ug/ml each of Phthalic acid,bis-2-ethylhexylester [CAS:117-81-7] ; Phthalic acid, bis-methyl ester [CAS:131-11-3] ; Phthalic acid, benzylbutyl ester [CAS:85-68-7] ; Phthalic acid, bis-butyl ester [CAS:84-74-2] ; Phthalic acid, bis-ethyl ester [CAS:84-66-2] ; Phthalic acid, bis-1-octyl ester [CAS:117-84-0] in Acetone