k1 = 1 
k2 = 3.32e-18 
k3 = 0.01 
k4 = 4 
k5 = 0.0004 
k6 = 1 
k7 = 1e-05 
k8 = 0.004 
k9 = 0.11 
k10 = 10000 
k11 = 10000