Find the exact value of \( s \) in the given interval that has the given circular function value. Do not use a calculator.
\( [ \frac { 3 \pi } { 2 } , 2 \pi ] ; \sin s = - \frac { \sqrt { 3 } } { 2 } \)
\( s = \square \) radians (Simplify your answer. Type an exact answer, using \( \pi \) as needed. Use integers or fractions for any numbers in the expression.)