The precomposed character you chose is not available (yet), neither in Unicode 2.0 nor in its TITUS extension.

List of Latin-based precomposed UNICODE characters with description of their elements.

TITUS extensions are in green.
LATIN CAPITAL LETTER X WITH GRAVE(X̀)
E35B582030058+030088+768
LATIN CAPITAL LETTER X WITH ACUTE(X́)
E35C582040058+030188+769
LATIN CAPITAL LETTER X WITH TILDE(X̃)
E35D582050058+030388+771
LATIN CAPITAL LETTER X WITH MACRON(X̄)
E35E582060058+030488+772
LATIN CAPITAL LETTER X WITH BREVE(X̆)
E35F582070058+030688+774
LATIN CAPITAL LETTER X WITH BREVE AND ACUTE(X̆́)
E360582080058+0306+030188+774+769
ẊLATIN CAPITAL LETTER X WITH DOT ABOVE(Ẋ)
1E8A78180058+030788+775
ẌLATIN CAPITAL LETTER X WITH DIAERESIS(Ẍ)
1E8C78200058+030888+776
LATIN CAPITAL LETTER X WITH RING ABOVE(X̊)
E361582090058+030A88+778
LATIN CAPITAL LETTER X WITH CARON(X̌)
E362582100058+030C88+780
LATIN CAPITAL LETTER X WITH CARON AND RING ABOVE RIGHT(X̌)
E363582110058+030C+F0B488+780+61620
LATIN CAPITAL LETTER X WITH INVERTED BREVE(X̑)
E364582120058+031188+785
LATIN CAPITAL LETTER X WITH COMMA ABOVE RIGHT(X̕)
E365582130058+031588+789
LATIN CAPITAL LETTER X WITH PALATALIZED HOOK(X̡)
E366582140058+032188+801
LATIN CAPITAL LETTER X WITH DOT BELOW(X̣)
E367582150058+032388+803
LATIN CAPITAL LETTER X WITH RING BELOW(X̥)
E368582160058+032588+805
LATIN CAPITAL LETTER X WITH MODIFIER LETTER SMALL V SUPERSCRIPT(Xv)
E369582170058++007688+118
LATIN CAPITAL LETTER X WITH RIGHT HALF RING ABOVE RIGHT(X)
E36A582180058+F0B388+61619
LATIN CAPITAL LETTER X WITH RING ABOVE RIGHT(X)
E36B582190058+F0B488+61620
LATIN CAPITAL LETTER X WITH ACUTE ABOVE RIGHT(X)
E36C582200058+F0D088+61648


 The precomposed character you chose is not available (yet), neither in Unicode 2.0 nor in its TITUS extension.