S1U1L1F4O1N1I1C3
13 points
SULFONIC is validvalid
containing a certain univalent radical
relating to a sulfone, any of a class of substances consisting of two organic radicals combined with SO2, also SULPHONIC
containing a certain univalent radical
relating to a sulfone, any of a class of substances consisting of two organic radicals combined with SO2, also SULPHONIC