be 0 1 be_2+ 2 1 c2h4 0 1 c2h4_2+ 2 1 c2h6 0 1 c2h6_2+ 2 1 c4h4 0 1 c4h4_2+ 2 1 ch2o 0 1 ch2o_2+ 2 1 h2s 0 1 h2s_2+ 2 1 mg 0 1 mg_2+ 2 1 n2h2 0 1 n2h2_2+ 2 1 nh3 0 1 nh3_2+ 2 1 ph3 0 1 ph3_2+ 2 1