4-Acetoxy-3,5-bis[N,N-bis(t-butoxycarbonylmethyl)aminomethyl]-3'-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodo-beta-methoxycarbonylphenethyl]benzophenone → 3,5-bis[N,N-bis(carboxymethyl)aminomethyl]-4-hydroxy-3'-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodo-beta-methoxycarbonylphenethyl]benzophenone

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A solution of 630 mg of 21 in 5 mL of trifluoroacetic acid was stirred overnight, diluted with water and the solid which separated was collected and dried; yield 550 mg. The field desorption mass spectrum showed 22 (m/e1305) is present, as well as some material in which the methyl ester of the thyroxine has been hydrolyzed to the acid.

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