▁they ▁had ▁ignored ▁existing ▁literature ▁on ▁Z in cke ▁but ▁held ▁on ▁to ▁the ▁ann ul ene ▁structure ▁based ▁on ▁their ▁electro sp ray ▁ion ization ▁( ES I ) ▁results ▁which ▁according ▁to ▁them ▁clearly ▁showed ▁dim er . ▁In ▁his ▁letter ▁Christ l ▁remarked ▁that ▁in ▁E SI ▁measurements ▁association ▁of ▁mole cules ▁is ▁a ▁common ▁phenomen on . ▁In ▁addition , ▁he ▁noted ▁similar ities ▁in ▁mel ting ▁point ▁and ▁N MR ▁spect ro sc opy . ▁ ▁As ▁of ▁December ▁ 2 0 0 7 ▁the ▁Japanese ▁group ▁ret ract ed ▁its ▁paper ▁in ▁Organ ic ▁Let ters ▁due ▁to ▁un cert aint ies ▁regarding ▁what ▁products ▁are ▁formed ▁in ▁the ▁reaction ▁described ▁and ▁the ▁US ▁group ▁added ▁a ▁correction ▁to ▁their s ▁in ▁the ▁An gew and te ▁Chem ie ▁stating ▁they ▁wish ( ed ) ▁to ▁alter ▁the ▁proposed ▁structure ▁of ▁( the ) ▁ann ul ene . ▁The ▁issue ▁did ▁receive ▁some ▁media ▁coverage : ▁ ▁References ▁ ▁Category : Sub st itution ▁re actions ▁Category : Name ▁re actions <0x0A> </s> ▁French - U ruguay an ▁relations ▁are ▁foreign ▁relations ▁between ▁Uruguay ▁and ▁France . ▁ ▁History ▁Uruguay ▁became ▁an ▁independent ▁nation ▁during ▁the ▁Pen ins ular ▁War , ▁a ▁conflict ▁between ▁France ▁and ▁Spain . ▁Uruguay ▁was ▁a ▁Spanish ▁territory ▁by ▁that ▁time , ▁as ▁the ▁Vic ero yal ty ▁of ▁the ▁Río ▁de ▁la ▁Pl ata , ▁and ▁thus ▁at ▁war ▁with ▁France , ▁but ▁the ▁war ▁never ▁left ▁Europe ▁and ▁the ▁Vic