begin parameters
 kp1 0.00001
 km1 0.01
 kp2 0.00001
 km2 0.01
 kp3 0.00001
 km3 0.01
 R0  100
 L0  100
end parameters

begin molecule types
  R(r,r)
  L(l,l)
end molecule types

begin seed species
  R(r,r) R0
  L(l,l) L0
end seed species

begin reaction rules
R(r) + L(l,l) <-> R(r!1).L(l!1,l) kp1,km1   # Ligand addition
R(r) + L(l,l!2) <-> R(r!1).L(l!1,l!2) kp2,km2   # Chain elongation
# R(r).L(l) <-> R(r!1).L(l!1) kp3,km3  # Ring closure
end reaction rules

generate_network({max_stoich=>{R=>5,L=>5}});