166541-17-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 166541-17-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,6,5,4 and 1 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 166541-17:
(8*1)+(7*6)+(6*6)+(5*5)+(4*4)+(3*1)+(2*1)+(1*7)=139
139 % 10 = 9
So 166541-17-9 is a valid CAS Registry Number.
166541-17-9Relevant articles and documents
A new synthesis of 2-substituted DL-tryptophan derivatives
Balsamini,Diamantini,Duranti,Spadoni,Tontini
, p. 370 - 372 (1995)
Methyl 2-substituted N-(diphenylmethylene)-DL-tryptophanates were prepared by means of Lewis acid catalysed Michael-type addition of methyl N-(diphenylmethylene)dehydroalaninate to suitable 2-substituted indoles. Hydrolysis of these tryptophan derivatives