has role gas molecular entity ethene Beilstein:1730731 chebi_ontology C2H4 CHEBI:24000 CHEBI:18153 Ethylene KEGG:C06547 28.05316 CAS:74-85-1 H2C=CH2 0 CHEBI:4899 C=C CH2=CH2 R-1150 Aethylen Gmelin:214 KNApSAcK:C00000175 Aethen ethene InChI=1S/C2H4/c1-2/h1-2H2 VGGSQFUCUMXWEO-UHFFFAOYSA-N 28.03130 BPDB:2009 CHEBI:14230 UM-BBD_compID:c0359 alkene plant hormone refrigerant