2-Amino-4,5-dihydro-5-hydroxy-4,4-dimethyl-naphtho[1,2-b:4,3-b']difuran-3-carboxylic acid ethyl ester

2-Amino-4,5-dihydro-5-hydroxy-4,4-dimethyl-naphtho[1,2-b:4,3 -b'']difuran-3-carboxylic acid ethyl ester