  In this paper, we examine mapping class group relations of some symplectic
manifolds. For each $n\geq 1$ and $k \geq 1$, we show that the $2n$-dimensional
Weinstein domain $W = \{f=\delta\} \cap B^{2n+2}$, determined by the degree $k$
homogeneous polynomial $f\in \mathbb{C}[z_0,\dots,z_n]$, has a Boothby-Wang
type boundary and a right-handed fibered Dehn twist along the boundary that is
symplectically isotopic to a product of right-handed Dehn twists along
Lagrangian spheres. We also present explicit descriptions of the
symplectomorphisms in the case $n=2$ recovering the classical chain relation
for the torus with two boundary components.
