The CAS Registry Mumber 47548-81-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,7,5,4 and 8 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 47548-81: (7*4)+(6*7)+(5*5)+(4*4)+(3*8)+(2*8)+(1*1)=152 152 % 10 = 2 So 47548-81-2 is a valid CAS Registry Number.
Synthesis of 4H-3,1-benzoxazin-4-ones and 4-(3H)quinazolinones from anthranilic acids and their derivatives by the use of triphenyl phosphite and pyridine
Rabilloud,Sillion
, p. 1065 - 1068 (1980)
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