ULTRA SHORT ACTING NEUROMUSCULAR BLOCKERS

Ultra short acting neuromuscular blocking agents of Formula (I) which are useful as skeletal muscle relaxants during emergency intubation procedures, routine surgery and post-operative settings are disclosed,wherein q and t are independently from 0 to 4; and X1 and X2 are independently halogen; ha and hb are independently from 0 to 2; Z1 and Z2 are independently hydrogen, C1-C6 alkyl, C2-C6 alkenyl or C2-C6 alkynyl with the proviso that Z1 and Z are not both hydrogen; Y1, Y2, Y3 and Y4 are independently hydrogen, halogen or C1-C3 alkoxy; m and p are independently 1 to 6; n and r are independently 0 to 4; with the proviso that if ha and hb are both 0, then r is 0 and n is 0 to 2; R1 and R14 are independently hydrogen, halogen, C1-C3 alkoxy, or R2 and R3 together with the carbon atoms to which they are bonded, R5 and R6 together with the carbon atoms to which they are bonded, may independently form a methylenedioxy or ethylenedioxy moiety contained in a five- or six-membered ring; W1 and W2 are carbon; and A is a pharmaceutically acceptable anion.