ein preferably R6 and R7 are each ethylene and R5 is [0156] Q is a bond and R1 is [0157] wherein the variables are chosen such that R1 is ???O???CH2???CH(OH)???; [0158] Q is a bond and R1 is [0159] wherein the variables are chosen such that R1 is ???CH(OH)???(CH2)2???; and [0160] Q is a bond and R1 is [0161] wherein the variables are chosen such that R1 is ???CH(OH)???CH2???S(O)0-2???. [0162] Meth