Oliveira, Elisabete et al. published their research in Journal of Photochemistry and Photobiology, A: Chemistry in 2013 | CAS: 3326-34-9

5-Amino-3′,6′-dihydroxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 3326-34-9) belongs to benzofurans derivatives. Benzofuran is the “”parent”” of many related compounds with more complex structures. For example, psoralen is a benzofuran derivative that occurs in several plants. As benzofurans are prone to undergo ring opening of the heterocycle, examples of reduction of this type of aromatics by using dissolving metals are rather scarce.COA of Formula: C20H13NO5

Non-toxic fluorescent alanine-fluorescein probe with green emission for dual colorimetric/fluorimetric sensing was written by Oliveira, Elisabete;Lorenzo, Julia;Cid, Antonio;Capelo, Jose Luis;Lodeiro, Carlos. And the article was included in Journal of Photochemistry and Photobiology, A: Chemistry in 2013.COA of Formula: C20H13NO5 This article mentions the following:

Two new fluorescent bio-inspired dyes 1 and 2 containing a fluorescein unit linked to a protected with a Boc group (N-tert-butyloxycarbonyl), and unprotected alanine residue were synthesized and characterized. The acid-base behavior was studied in water/ethanol (60/40) and at pH = 8 a strong emission fluorescence, followed by a color change from colorless to yellow was observed Photophys. studies in water HEPES buffered solution toward alk., alk. earth, transition, and post- transition metal ions were performed. Compounds 1 and 2 revealed to be very sensitive to Hg2+ with colorimetric changes from yellow to pink in the presence of HEPES buffer. Moreover, compound 1 show a color change from yellow to orange in the presence of the neurotransmitter mol. dopamine. Compound 2 also reveals to be sensitive to Cu2+ and Ni2+, being able to detected and quantified in HEPES buffer ca. 0.37 ppm and ca. 1.50 ppm of Cu2+, resp. Very small silver nanoparticles coated with compound 2 of ca. 3.68 ± 0.93 nm were successfully synthesized and characterized. Toxicol. studies with both compounds were also carried out. In the experiment, the researchers used many compounds, for example, 5-Amino-3′,6′-dihydroxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 3326-34-9COA of Formula: C20H13NO5).

5-Amino-3′,6′-dihydroxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one (cas: 3326-34-9) belongs to benzofurans derivatives. Benzofuran is the “”parent”” of many related compounds with more complex structures. For example, psoralen is a benzofuran derivative that occurs in several plants. As benzofurans are prone to undergo ring opening of the heterocycle, examples of reduction of this type of aromatics by using dissolving metals are rather scarce.COA of Formula: C20H13NO5

Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem