157220-22-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 157220-22-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,2,2 and 0 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 157220-22:
(8*1)+(7*5)+(6*7)+(5*2)+(4*2)+(3*0)+(2*2)+(1*2)=109
109 % 10 = 9
So 157220-22-9 is a valid CAS Registry Number.
157220-22-9Relevant academic research and scientific papers
Synthetic Studies toward Ciguatoxin. Stereocontrolled Construction of the KLM Ring Fragment
Sasaki, Makoto,Inoue, Masayuki,Tachibana, Kazuo
, p. 715 - 717 (2007/10/02)
The first stereoselective synthesis of the KLM ring fragment of ciguatoxin is reported including as a key step 7-endo selective cyclization of epoxy alcohol to construct a fully substituted oxepane ring (12 -> 13).
