66187-97-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 66187-97-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,1,8 and 7 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 66187-97:
(7*6)+(6*6)+(5*1)+(4*8)+(3*7)+(2*9)+(1*7)=161
161 % 10 = 1
So 66187-97-1 is a valid CAS Registry Number.
66187-97-1Relevant articles and documents
Synthesis of cimetidine
Kairisalo,Honkanen
, p. 688 - 690 (1983)
A simple and economical synthesis of cimetidine is described. It is based on the reaction of 4-halomethyl-5-methylimidazole with N-cyano-N'-methyl-N''-(2 mercaptoethyl)guanidine in water-ethanol at pH 9.0 ± 0.3. Pure crystalline cimetidine is obtained in about 75% yield.