CAS: 503-17-3 Molecular Formula: C4H6 Molecular Weight (g/mol): 54.092 MDL Number: MFCD00009275 InChI Key: XNMQEEKYCVKGBD-UHFFFAOYSA-N Synonym: 2-butyne,dimethylacetylene,crotonylene,unii-lke6d3018e,ch3cequivcch3,1,2-dimethylvinylene,1-methyl-1-propynyl,2-butyn,acmc-209kl9 PubChem CID: 10419 IUPAC Name: but-2-yne SMILES: CC#CC