CH250 OrG.Chem
(^.^) T.T Y.Y (-: 0_o :P (^.^) T.T Y.Y (-: 0_o :P (^.^) T.T Y.Y (-: 0_o :P
Sunday, 27 November 2011
cis, trans (การอ่านชื่ออัลคีน)
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