// Created by libAntimony v2.8.0
model *Model_1()

  // Compartments and Species:
  compartment compartment_;
  species II in compartment_, M in compartment_, IIa in compartment_, P2 in compartment_;

  // Reactions:
  r1: II => M; compartment_*r1_k1*II;
  r2: M => IIa; compartment_*r2_k1*M;
  r3: II => P2; compartment_*r3_k1*II;
  r4: P2 => IIa; compartment_*r4_k1*P2;

  // Species initializations:
  II = 1;
  M = 0;
  IIa = 0;
  P2 = 0;

  // Compartment initializations:
  compartment_ = 1;

  // Variable initializations:
  r1_k1 = 0.005;
  r2_k1 = 0.01;
  r3_k1 = 1e-005;
  r4_k1 = 2.5e-005;

  // Other declarations:
  const compartment_;

  // Unit definitions:
  unit substance = 1e-6 mole;
end