resorcinolphthalein

[ri-zawr-suh-nawl-thal-een, -ee-in, -fthal-, -nol-, rez-awr-] /rɪˈzɔr sə nɔlˈθæl in, -i ɪn, -ˈfθæl-, -nɒl-, rɛzˈɔr-/
noun, Chemistry
1.
fluorescein.
Origin
resorcinol + phthalein