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This is where Loschmidt introduces the phenyl group, starting with 181, which shows alternating C=C and C-C allene structure, which he discounts, following on with the layered sausage formula, which he also discounts, and ending with 185, which is meant to represent the uncertainty in the structure. Contrast this hesitation with its absence for 239. Had he substituted N in this latter structure by CH, he would have achieved the modern formula.