Described herein are crystalline forms of (3, 5-dibromo-4-hydroxyphenyl) (2-(1-hydroxyethyl) benzofuran-3-yl-4, 5, 6, 7-d.sub.4) methanone, and solvates thereof.

A process for preparing acylglycinates of the formula (I) wherein R.sup.1 is a linear or branched, saturated alkanoyl group having 6 to 30 carbon atoms, or is a linear or branched, singly or multiply unsaturated alkenoyl group having 6 to 30 carbon atoms, and Q.sup.+ is a cation, wherein glycine is reacted with fatty acid chloride R.sup.1Cl, in water and in the presence of a basic alkali metal compound which yields cations Q.sup.+, but in the absence of organic solvents, at 25-50 C. Also described are compositions comprising acylglycinates of the formula (I). ##STR00001##

A process for preparing acylglycinates of the formula (I) wherein R.sup.1 is a linear or branched, saturated alkanoyl group having 6 to 30 carbon atoms, or is a linear or branched, singly or multiply unsaturated alkenoyl group having 6 to 30 carbon atoms, and Q.sup.+ is a cation, wherein glycine is reacted with fatty acid chloride R.sup.1Cl, in water and in the presence of a basic alkali metal compound which yields cations Q.sup.+, but in the absence of organic solvents, at 25-50 C. Also described are compositions comprising acylglycinates of the formula (I). ##STR00001##