Also, the same study revealed that alterporriol C (114) had a modest antiviral activity with an MIC value of 39.0 μM . In addition, the other anthraquinone dimers, alterporriol U (121) and V (122) exhibited a narrow spectrum of antibacterial bioactivity against the Gram-positive bacterium, B. cereus with MIC values of 8.3 and 8.1 μM, respectively .