Abstract
The structure of 4(dimethylamino)-1, 4, 4a, 5, 5a, 6, 11, 12a-octahydro-3, 5, 10, 12, 12a-pentahydroxy-6-methylene-1, 11-dioxo-2-naphthacenecarboxamide hydrobromide salt was determined by an X-ray analysis. One methacycline cation and one bromide anion were found in the asymmetric unit of an orthorhombic cell, space group P212121,a 9.580(1),b 12.147(2),c 18.735(3) a,V2180.0(5) a3, Z4,Dc 1.59 g cm−3, Μ(MoKα) 19.15 cm−1. The structure was solved and refined toR(F) 0.062 andRw(F) 0.064 by a full matrix least-squares procedure. The conformation of the methacycline cation is found to be similar to that reported for 6-demethyl-7-chlorotetracycline hydrochloride trihydrate.
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