eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-05-06 9 1 39 42 9446 article Wafaa H. B. Hassan 1,2 Department of Pharmacognosy, King Saud University, Kingdom of Saudi Arabia. Department of Pharmacognosy, Zagazig University, Zagazig, Egypt. An Indonesian specimen of marine sponge Hyrtios reticulatus was found to contain a new b-carboline alkaloid [4-carboxy-6-hydroxy-b- carboline]. The structure was determined on the basis of spectral properties (ESI/MS/MS, UV and 1H NMR) and through comparison with the reported b-carboline alkaloids. https://www.biotech-asia.org/vol9no1/new-b-carboline-alkaloid-from-marine-sponge-hyrtios-reticulatus/ Hyrtios reticulatus b-carboline alkaloid antimicrobial; cytotoxic activity