Abstract: Ultrashort 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: X is a halogen; h is from 1 to 2; Y is hydrogen or methoxy; Z1 and Z2 are methyl; W1 and W2 are carbon; and A is a pharmaceutically acceptable anion.

Abstract: 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; X1 and X2 are independently halogen; ha and hb are independenity from 0 to 2; Z1 and Z2 are indepentdently hydrogen, C1-6 alkyl, C2-6 alkenyl or C2-6 alkynyl with the proviso that Z1 and Z2 are not both hydrogen; Y1, Y2, and Y3 and Y4 are independently hydrogen, halogen or C1-3 alkoxy; m and p are independently 1 to 6; n and r are independently 0 to 4; with the proviso the if ha and hb are both 0, then r is 0 and n is 0 to 2; R1 to R14 are independently hydrogen, halogen, C1-3 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, R9 and R10 together with the carbon atoms to which they are bonded, R12 and R13 together with the carbon atoms to which they are bonded, may