The CAS Registry Mumber 1402012-58-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,0,2,0,1 and 2 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1402012-58: (9*1)+(8*4)+(7*0)+(6*2)+(5*0)+(4*1)+(3*2)+(2*5)+(1*8)=81 81 % 10 = 1 So 1402012-58-1 is a valid CAS Registry Number.