Try:
HoldForm[MeijerG[{{1, 1}, {}}, {{1}, {0}}, x]] // TraditionalForm
MeijerG[{{1, 1}, {}}, {{1}, {0}}, x]
(*Log[1 + x]*)
MeijerGReduce[Log[1 + x], x]
(*Inactive[MeijerG][{{1, 1}, {}}, {{1}, {0}}, x]*)
If you have it written in Latex we can extract to MMA Input form:
HoldForm[\!\(\*
TagBox[
RowBox[{"MeijerG", "[",
RowBox[{
RowBox[{"{",
RowBox[{
RowBox[{"{",
RowBox[{"1", ",", "1"}], "}"}], ",",
RowBox[{"{", "}"}]}], "}"}], ",",
RowBox[{"{",
RowBox[{
RowBox[{"{", "1", "}"}], ",",
RowBox[{"{", "0", "}"}]}], "}"}], ",", "x"}], "]"}],
HoldForm]\)] // TeXForm
(ToExpression[%, TeXForm] // Quiet)[[1]]