Change the sentence into negative

I am not sure why you would need to do so, but first of all, you have misquoted Shakespeare: the exact quote from Romeo and Juliet is What's in a name? That which we call a rose By any other name would smell as sweet, and it is frequently revised (both for concision, and to render the unusual capitalization, which was on account of line breaks in the dramatic text, more normative for written prose) as A rose by any other name would smell as sweet.  Writing the rose instead of a rose is inaccurate and does not make sense.

Converting it to a negative expression would result in the following: A rose by any other name would not smell as sweet.