The CAS Registry Mumber 78221-80-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,2,2 and 1 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 78221-80: (7*7)+(6*8)+(5*2)+(4*2)+(3*1)+(2*8)+(1*0)=134 134 % 10 = 4 So 78221-80-4 is a valid CAS Registry Number.
Synthesis of oxytocin, arginine-vasopressin and its deamino-analogue using 2,4,6-trimethylbenzyl group for protection of the cysteine sulfur
Brtnik,Krojidlo,Barth,Jost
, p. 286 - 299 (2007/10/02)
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