# Reversible Substrate Inhibition
# Example 4, Mincheva and Roussel 2007
# 4 complexes
[A1] -> ; k1
 -> [A1]; k2
[A1] + [A2] -> [A3] ; k3
[A3] -> [A2] ; k4
[A1] + [A3] -> [A4] ; k5
[A4] -> [A1] + [A3] ; k6
