Rhodamine B: spot the fabricated intermediate

Phthalic anhydride plus two equivalents of 3-(diethylamino)phenol, ZnCl2 catalyst, neat, 180 C, 6 hours. Drawn as a phthalic acid bis-amide on both diethylamino N atoms.

Acid-catalyzed rearrangement and xanthene closure to give rhodamine B. Drawn as if the bis-amide can rearrange to the C-acylated benzophenone and then cyclize.