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Results of measures of melting point, X-ray analysis and infrared spectroscopy are presented for the identification of two polymorphs of acid S-ethyl-S-sec-butyl barbiturate (butabarbital). The structure of polymorph 11was refined simultaneously with two sets of data of different origins. The crystallographic data is a=1O,280 A b = 20,091 c = 11,920 jJ=llOo30' monoclinic system, space group 12/ c with eight molecules per unit cell. The results obtained with the two data sets agree nothing experimental error. It neas proved the existence of disorder in the structure and on analyses done about the problems of refinement.

Refinamento da estrutura cristalina de um polimorfo do ácido 5-etil-5-sec-butil barbiturico (butabarbital)