Reaction channel
Reaction rate
R1
S 1 → ∅
c 1 = 2.0
R2
S 2 → ∅
c 2 = 0.1
R3
∅ → S 1
c 3 = 25
R4
∅ → S 2
c 4 = 75
R5
S 1 + S 2 → S 1 + S 1
c 5 = 0.05