Methanesulfonic acid, trifluoro-, 3,4-dihydro-4-methyl-2H-pyran-6-yl
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The CAS Registry Mumber 790661-89-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,9,0,6,6 and 1 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 790661-89: (8*7)+(7*9)+(6*0)+(5*6)+(4*6)+(3*1)+(2*8)+(1*9)=201 201 % 10 = 1 So 790661-89-1 is a valid CAS Registry Number.