Ultraviolet/visible spectrum (maximum in nm, layer thickness 1 cm, in parentheses - extinction) = 263 Ultraviolet/visible spectrum (maximum in nm, layer thickness 1 cm, in parentheses - extinction) = 257 Ultraviolet/visible spectrum (maximum in nm, layer thickness 1 cm, in parentheses - extinction) = 252
References:
Clarke's Analysis of Drugs and Poisons. - 4 ed. - London, 2011. - pp. 1220
Clarke's isolation and identification of drugs. - 2ed. - London: Pharmaceutical press, 1986. - pp. 522-523
Kleemann A. Pharmaceutical Substances. - 2000. - pp. 617-619