连续比较

Question

当我尝试进行复合比较时，括号的使用似乎无法正确工作，如下所示？

\documentclass [letterpaper, 12pt]{article}
\usepackage{etoolbox}
\begin {document}
\def\TrnsATypeA {Sale and Mortgage}
\def\MortPolAAmtB {350,000}
\ifdefstring{\TransATypeA}{Sale and Mortgage}
{\ifdef {\MortPolAAmtB}}
{\input {J:/TITLE_COMMITMENT/A1-0001c.tex}}\par %Second Loan
{}
{}

\end {document}