below in table 9 a generic mg u2014 al u2014 oh tmt type of htlc was produced in similar fashion as described in example 7 except that in the present example 20 g of the mg u2014 al u2014 o mixed oxide precursor was dispersed in 200 ml water containing 19 0 g of tmt in dispersed form and was stirred for 4 four hours the resultant filtrate had a ph 8 7 relevant analytical data are shown below in table 10 and the pertinent ir spectrum is presented in fig3 the high load 40 by weight of tmt in the resultant htlc derivative was noted as significant a generic mg u2014 al u2014 oh mbt type of htlc where mbt stands for 2 mercaptobenzothiazole was produced in similar fashion as described in example 7 except that in the present example 20 g of the mg u2014 al u2014 o mixed oxide precursor was dispersed in 200 ml water containing 9 0 g of mbt in dispersed form and was stirred for 4 four hours the resultant filtrate was determined gravimetrically by precipitation at ph 3 to contain approximately 0 6 g of mbt the filtrate 39 s ph was determined to be 9 0 relevant analytical data is shown below in table 11 and.