The CAS Registry Mumber 66570-90-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,5,7 and 0 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 66570-90: (7*6)+(6*6)+(5*5)+(4*7)+(3*0)+(2*9)+(1*0)=149 149 % 10 = 9 So 66570-90-9 is a valid CAS Registry Number.
Studies on 3-substituted 1,2-benzisoxazole derivatives. IV. Rearrangement of N-substituted 2H-1,2-benzisoxazolin-3-one to 2-substituted 2H-1,3-benzoxazin-4-one
Uno,Kurokawa
, p. 549 - 555 (1978)
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