The CAS Registry Mumber 55902-49-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,9,0 and 2 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 55902-49: (7*5)+(6*5)+(5*9)+(4*0)+(3*2)+(2*4)+(1*9)=133 133 % 10 = 3 So 55902-49-3 is a valid CAS Registry Number.
Research in antitumor chemotherapy. XIII. Cytotoxic action on cultured tumor cells shown by α substituted β nitrostyrenes and β substituted α nitrostilbenes