211796-43-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 211796-43-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,1,7,9 and 6 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 211796-43:
(8*2)+(7*1)+(6*1)+(5*7)+(4*9)+(3*6)+(2*4)+(1*3)=129
129 % 10 = 9
So 211796-43-9 is a valid CAS Registry Number.
211796-43-9Relevant articles and documents
A benzo-fused oxapenem from a β-lactam-4-ylidene
Couture, Philippe,Warkentin, John
, p. 241 - 244 (2007/10/03)
Spiro-fused β-lactam oxadiazoline 2a was prepared from acetone semicarbazone in five steps. Thermolysis of 2a at 100°C in benzene led to carbene 3a, which cyclized to the benzo-fused oxapenem derivative 4 via intramolecular OH insertion. Compound 10, with