The CAS Registry Mumber 185419-42-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,4,1 and 9 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 185419-42: (8*1)+(7*8)+(6*5)+(5*4)+(4*1)+(3*9)+(2*4)+(1*2)=155 155 % 10 = 5 So 185419-42-5 is a valid CAS Registry Number.
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2,3,5-trimethyl-6-(7,11,15-trimethyl-3-methylene-6,10,14-hexadecatrien
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