k1 = 0.016481 
k2 = 100 
k3 = 1.0856e-09 
k4 = 9.3252e-08 
k5 = 1.3461e-07 
k6 = 9.0354e-07 
k7 = 0.0031777 
k8 = 1 
k9 = 100