P3H4T1H4A1L1E1I1N1S1
18 points
PHTHALEINS is validvalid
PHTHALEIN, [n]
PHTHALEIN, any one of a very important class of dye-yielding materials formed by the union of phenols with phthalic anhydride [n]
PHTHALEIN, [n]
PHTHALEIN, any one of a very important class of dye-yielding materials formed by the union of phenols with phthalic anhydride [n]