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. 2014 Apr 22;19(4):5088–5108. doi: 10.3390/molecules19045088

Figure 3.

Dibenzo-α-pyrones produced by transformation of intestinal bacteria.

Figure 3

Dibenzo-α-pyrone R1 R2 R3 R4 R5 Reference
Urolithin A (40) OH H OH H H [6]
Urolithin B (42) OH H H H H [6]
Urolithin C (43) OH H OH OH H [6]
Urolithin D (44) OH OH OH OH H [59]
Urolithin E (45) OH OH OH H OH [59]
Urolithin M-5 (46) OH OH OH OH OH [7]
Urolithin M-6 (47) OH H OH OH OH [7,59]
Urolithin M-7 (48) OH H OH H OH [7,11]
Isourolithin A (41) OH H H OH H [7]
Isourolithin B (49) H H H OH H [7]
8-O-Methylurolithin A (50) OH H OCH3 H H [6]
8,9-Di-O-methylurolithin C (51) OH H OCH3 OCH3 H [6]
8,9-Di-O-methylurolithin D (52) OH OH OCH3 OCH3 H [6]