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  • 17:4417:44, 20 September 2011 diff hist +41 Isobutyleneyou don't need to show the 2 on methylpropene, there is only one place the 2 can go. I'm pretty sure methylpropene is the IUPAC name too not 2-methylpropene but it would be better if someone verified this. 2-methylprop-2-ene is an extra name.

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