Elements
H  C

SPECIES
R1A R1B H P1
END

SPAM
R1A + R1B = H + P1      1.2345e12  1.0  200.0
END

reactions cal/mol
R1A + R1B = H + P1      1.2345e12  1.0  200.0
R1A + R1A = H + P1      5.4321e10  1.0  500.0