Propose an efficient synthesis for the following transformation: 4- The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagents) in the correct order, as a string of letters (without spaces or punctuation, such as 'EBF"). If there is more than one correct solution provide just one answer. B HBr. ROOR 1) xs NaNH2 2) H20 1) O3 2) DMS D E F HBr H, Lindlar's catalyst t-BuOK 1 G H Br, hv NaOEt NaCN