... % and 98% 2-Nonanone (Methyl Heptyl Ketone) CAS number: 821-55-6, FEMA Number: 2785 Molecular formula C9H18OMolecular weight 142.24FEMA ... Number 2785CAS Number 821-55-6 Odour With flavours of fruits, flowers, oils and herbsAppearance ... stored below 25°C Natural 2-Nonanone (CAS NO. 821-55-6)