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 SMALL LETTER B WITH CIRCUMFLEX(b̂)
E445584370062+030298+770
LATIN SMALL LETTER B WITH CIRCUMFLEX AND MACRON BELOW(ḇ̂)
E446584380062+0302+033198+770+817
LATIN SMALL LETTER B WITH TILDE ABOVE(b̃)
E447584390062+030398+771
ḃLATIN SMALL LETTER B WITH DOT ABOVE(ḃ)
1E0376830062+030798+775
LATIN SMALL LETTER B WITH DIAERESIS(b̈)
E448584400062+030898+776
LATIN SMALL LETTER B WITH COMMA ABOVE RIGHT(b̕)
E449584410062+031598+789
LATIN SMALL LETTER B WITH PALATALIZED HOOK BELOW(b̡)
E44A584420062+032198+801
ḅLATIN SMALL LETTER B WITH DOT BELOW(ḅ)
1E0576850062+032398+803
LATIN SMALL LETTER B WITH RING BELOW(b̥)
E44B584430062+032598+805
LATIN SMALL LETTER B WITH CARON BELOW(b̬)
E44C584440062+032C98+812
ḇLATIN SMALL LETTER B WITH LINE BELOW(ḇ)
1E0776870062+033198+817
ƀLATIN SMALL LETTER B WITH STROKE(b̵)
01803840062+033598+821
LATIN SMALL LETTER B WITH SUPERSCRIPT ONE(b1)
E450584480062++003198+49
LATIN SMALL LETTER B WITH SUPERSCRIPT TWO(b2)
E451584490062++003298+50
LATIN SMALL LETTER B WITH CAUCASIAN MODIFIER LETTER PHARYNGEAL MARKER(b)
ED0D606850062+EFB198+61361
LATIN SMALL LETTER B WITH ACUTE ABOVE RIGHT(b)
E44E584460062+F0D098+61648
LATIN SMALL LETTER B WITH VERTICAL LINE ABOVE RIGHT(b)
E44F584470062+F0D198+61649


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