The CAS Registry Mumber 207300-72-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,7,3,0 and 0 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 207300-72: (8*2)+(7*0)+(6*7)+(5*3)+(4*0)+(3*0)+(2*7)+(1*2)=89 89 % 10 = 9 So 207300-72-9 is a valid CAS Registry Number.
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Aldrich
(G5000) DL-Glyceric acid hemicalcium salt hydrate 99%