$\text{ IUPAC name for complex }\left[\mathrm{Mn}\left(\mathrm{\pi }-{\mathrm{C}}_6{\mathrm{H}}_5\right)(\mathrm{CO}{)}_3\right]:$

$\text{ Tricarbonyl }\left({\mathrm{\eta }}^5\right.\text{-cyclopentadiene)manganese(I) }$

$\left({\mathrm{\eta }}^5\right.\text{-cyclopentadienyl) tricarbonyl manganese(1) }$

$\text{ Tricarbonyl ( }{\mathrm{\eta }}^5\text{-cyclopentadiene)manganate(I) }$

$\text{ Tricarbonyl ( }{\mathrm{\eta }}^5\text{-cyclopentadienyl)manganese(I) }$