CAS 666-52-4 appears in our catalog under these names: Acetone-d{6}, 99.9% (Isotopic) , Acetone-d{6}, 100% (Isotopic) , Acetone-d{6}, 100%(Isotopic), contains 0.03% v/v TMS , Acetone-d{6}, 99.9% (Isotopic), contains 1% v/v TMS . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 10g, *5x10g, 10each , 10each, 2each, 25g.