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wht is you dont understand?? for what price could you buy 2ce ?

its a structural difference shortly so if there are two substance with the same standard formula for eg c3h8o and there is another one with the same standard formula c3h8o but if you see its structure in the space you see they are different http://en.wikipedia.org/wiki/Isomer

do you need a legit supplier?

if you write an mal ress I give you one

:lol: where do you heared this f..... alsh:lol: info how can be C13H21NO2 optical isomer of C12H19NO2 do you know what is isomeria???????

this is a legit site http://www.tradevv.com/chinasuppliers/chwhtltd they can shipp little amounts also and their products quality is excellant