Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'crosatoside B'?

A. A trisaccharide derivative consisting of a beta-D-glucosyl residue glycosidically linked to a 5-aminopentyl group and which carries at O-3 a beta-D-glucosyl-(1->3)-2,4-di-O-acetyl-6-deoxy-alpha-L-talosyl disaccharide unit.
B. A glycosylglucose derivative that is alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranose in which the anomeric hydroxy hydrogen has been replaced by a 2-(4-hydroxyphenyl)ethyl group.
C. A para-terphenyl that consists of 1,4-diphenylbenzene substituted by acetyloxy group at position 3', hydroxy groups at positions 4 and 4'' a (3-hydroxybutanoyl)oxy group at position 6' and [3-(acetyloxy)butanoyl]oxy groups at positions 2' and 5' respectively. It is isolated from the fruit body of the mushroom Paxillus curtisii and exhibits radical scavenging activity.
D. An aromatic amide obtained by formal condensation of the carboxy group of 4-oxo-1,4-dihydroquinoline-3-carboxylic acid with the amino group of 5-amino-2,4-di-tert-butylphenol. Used for the treatment of cystic fibrosis.

Answer: A glycosylglucose derivative that is alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranose in which the anomeric hydroxy hydrogen has been replaced by a 2-(4-hydroxyphenyl)ethyl group.