Bi′⁡(z)=31/6Γ⁡(13)⁢ⅇ-ζ⁢F11⁡(-16;-13;2⁢ζ)+37/627/3⁢Γ⁡(23)⁢ζ4/3⁢ⅇ-ζ⁢F11⁡(76;73;ζ).