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S c h. C2h5-Ch=ch2. H2c c ch3. Ch3-c--c-c2h5. C2h5-ch2-ch2-c2h5.
C2h5-Ch=ch2. H2c c ch3. Ch3-c--c-c2h5. C2h5-ch2-ch2-c2h5.

See also