In the paper "Pharmacokinetics and metabolism of N-[N-[3-(3-hydroxy-4-methoxyphenyl) propyl]-α-aspartyl]-L-phenylalanine 1-methyl ester..." (Food Chem Toxicol. 2011 Nov;49 Suppl 1:S8-29) is reported that advantame is metabolized to ANS9801-acid.
However, the structure for ANS9801-acid looks the same as that I have found for advantame in spiderchem, as shown in the picture.
What is the structure of ANS9801-acid, also known as de-esterified advantame?
The abstract of the paper you mention states:
Data indicated that absorption was mainly as ANS9801-acid (de-esterified advantame), which was formed in the gastrointestinal tract as a result of the hydrolysis of the methyl ester group of the parent compound.
So, in the picture, you provided ANS9801 is equivalent to Advantame (if we omit the water molecule included in Advantame). But the paper clearly mentions ANS9801-acid, that indicates the structure of ANS9801 without methyl ester functionality (which has been hydrolyzed to free acid, meaning that ANS9801-acid has, in fact, two carboxylic groups).
The exact structure is provided and subscribed as ANS9801-acid in Fig.22, showing the proposed metabolic pathway of ANS9801, in the paper you cite.
Mateusz answer is correct, both included structures are the same. The mentioned ANS9801-acid refers to the hydrolysis of parent ANS9801, which is the methyl ester. Presumably ANS9801 is the internal Ajinomoto compound number used in the development of the Advantame.
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