2 6 dimethylpyridine nmr July 8, 2019 16 32 64 128 Diethyl 2 6 dimethylpyridine 3 5 dicarboxylate nmr 2 6-dimethylpyridine 2 d nmr 2 6-dimethyl-4-pyrone 2 6-dimethylphenol nmr