\[- ab\left( a^{2}b - ab^{2} - a^{3}b^{3} \right) \cdot p =\]
\[= - abp \cdot \left( a^{2}b - ab^{2} - a^{3}b^{3} \right) =\]
\[= - a^{3}b^{2}p + a^{2}b^{3}p + a^{4}b^{4}p.\]