The CAS Registry Mumber 78443-15-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,4,4 and 3 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 78443-15: (7*7)+(6*8)+(5*4)+(4*4)+(3*3)+(2*1)+(1*5)=149 149 % 10 = 9 So 78443-15-9 is a valid CAS Registry Number.
Asymmetric total synthesis of erythromycin. 3. Total synthesis of erythromycin
Woodward,Logusch,Nambiar,et al.
, p. 3215 - 3217 (1981)
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