begin parameters
  R0   100
  L0   500
  A0   100
  kon  0.01
  koff  0.1
  kAon  0.01
  kAoff  0.1
  kAp 0.01
  kAdp 0.1
end parameters

begin molecule types
   R(l,a)
   L(r)
   A(r,Y~U~P)
end molecule types

begin seed species
  R(l,a)   R0    
  L(r)   L0
  A(r,Y~U)   A0
end seed species

begin reaction rules
   R(l) + L(r) <-> R(l!1).L(r!1) kon,koff
   R(a) + A(r) <-> R(a!1).A(r!1) kAon,kAoff
   L().R().A(Y~U) -> L().R().A(Y~P)  kAp
   A(Y~P) -> A(Y~U)   kAdp
end reaction rules

begin observables
  Molecules A_P  A(Y~P)
  Molecules A_unbound_P  A(r,Y~P)
  Molecules A_bound_P  A(r!+,Y~P)
  Molecules RLA_P  R().L().A(Y~P)
end observables

generate_network();
writeSBML();
simulate_ode({t_end=>50,n_steps=>20});