filter4dフェノールレッド liquid, 0.5%, sterile-filtered, BioReagent, suitable for cell culture; CAS Number: 143-74-8; Synonyms: Phenolsulfonphthalein solution at Sma-AldrichFiltered is a learning tech pany that helps organisations get the best return on their L&D spend. That means using data to decide on the most important skills for an organisation.