131998-54-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 131998-54-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,9,9 and 8 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 131998-54:
(8*1)+(7*3)+(6*1)+(5*9)+(4*9)+(3*8)+(2*5)+(1*4)=154
154 % 10 = 4
So 131998-54-4 is a valid CAS Registry Number.
InChI:InChI=1/C27H42N6O6/c1-10(2)16-25-31-20(13(7)37-25)23(35)29-18(12(5)6)27-33-21(15(9)39-27)24(36)30-17(11(3)4)26-32-19(14(8)38-26)22(34)28-16/h10-21H,1-9H3,(H,28,34)(H,29,35)(H,30,36)/t13-,14-,15-,16+,17+,18+,19+,20+,21+/m1/s1
131998-54-4Relevant articles and documents
Synthesis of cyclopeptide alkaloids by cyclooligomerization of dipeptidyl oxazolines
Wipf, Peter,Miller, Chris P,Grant, Charsetta M
, p. 9143 - 9150 (2007/10/03)
Cyclodehydration of Cbz-valylthreonine methyl esters with Burgess reagent provides access to cis- and trans-oxazoline segments for cyclooligomerization reactions. The ratio of 12-, 18-, 24-, and larger-ring macrocycles obtained in this process is kinetica