  Using Composition--Diamond Lemma we construct presentations of groups $G =
\langle x_1,\ldots,x_n \, | \, r_1,\ldots, r_m \rangle$ with the following
property; for a fixed $1 \le i \le n$, and for all $1 \le j \le m$, Fox
derivatives $\partial r_j / \partial x_i$ have common divisor. It follows that
if $\pi_2(K) \ne 0$, where $K$ is the standard $2$-complex associated with $G$
then the group ring $\mathbb{Z}[G]$ has nontrivial zero divisors.
