The CAS Registry Mumber 91101-10-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,1,0 and 1 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 91101-10: (7*9)+(6*1)+(5*1)+(4*0)+(3*1)+(2*1)+(1*0)=79 79 % 10 = 9 So 91101-10-9 is a valid CAS Registry Number.
Heterocyclic dicarboxylic acid esters, IV: Reaction of dimethyl 4,5-dihydro-2,3-furandicarboxylates with urea. Synthesis of 5-(2-oxotetrahydro-3-furanylidene)hydantoins
Lehmann
, p. 459 - 465 (1984)
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