CAS Chemical Name SMILES #Obs_CA_with_S9 #in vitro predicted CA with S9 Metabo Smiles Reference 57-57-8 Beta-Propiolactone O=C1CCO1 in vitro CA positive in vitro CA positive O=C1CCO1 Sofuni, T., Ed. (1998). Data Book of Chromosomal Aberration Test in vitro, Revised Edition. Life-Science Information Center, Tokyo, Japan