k1 = Open_probability
k2 = compartment
k3 = __lp_r2_ka_minus
k4 = __lp_r2_ka_plus
k5 = __lp_r2_Ca
k6 = __lp_r2_n
k7 = __lp_r3_kb_plus
k8 = __lp_r3_Ca
k9 = __lp_r3_m
k10 = __lp_r3_kb_minus
k11 = __lp_r4_kc_plus
k12 = __lp_r4_kc_minus
k13 = __cm_k13