  A consistent truncation of IIB on S^5 has been obtained in the sector of the
metric and the 4-form potential. The ansatz contains 20 scalars and all 15
gauge fields of ${\cal N}=8$ gauged supergravity in five dimensions. With this
fully non-linear ansatz, the calculations for n-point correlators of super
Yang-Mills (SYM) theory via AdS/CFT are simpler than those in the literature
that use {\em linear} ansatz followed by non-linear field redefinitions. We
work out the SYM operators that couple to the scalars by expanding the
Dirac-Born-Infeld (DBI) action plus Wess-Zumino (WZ) terms around an
$AdS_5\timesS^5$ background with the metric fluctuations. The resulting
operators agree with those based on a superconformal symmetry argument. We
discuss the significance of our results.
