| abstract |
A compound represented by formula (I) wherein R1 is (1) unsubstituted, (2) a hydrogen atom, (3) a hydrocarbon group optionally having a substituent (s) selected from substituted group A or (4) acyl; R2 is (1) an atom hydrogen, (2) a hydrocarbon group optionally having a substituent (substituents) selected from substituted group A, (3) hydroxy optionally having a hydrocarbon group optionally having a substituent (substituents) selected from substituted group A, (4) amino optionally having 1 or 2 hydrocarbon groups optionally having a substituent (s) selected from substituent group A, (5) a group represented by the formula -SR20, wherein R20 is a hydrocarbon group optionally having a substituent (s) selected from substituent group A, (6) a group represented by formula -S (O) R21, wherein R21 is a hydrocarbon group optionally having a substituent (s) selected from substituted group A, (7) a group represented by formula -S (O) 2R 22, wherein R22 is a hydrocarbon group optionally having a substituent (s) selected from substituent group A, (8) a heterocyclic group optionally having a substituent (s) selected from substituent group A or (9) acyl; R3 is ( 1) unsubstituted, (2) hydrogen atom, (3) hydrocarbon group optionally having substituent (substituents) selected from substituent group A, (4) hydroxy optionally having hydrocarbon group optionally having substituent (substituents) selected from substituent group A, (5) an amino optionally having 1 or 2 hydrocarbon groups optionally having a substituent (s) selected from the substituted group A, (6) a group represented by the formula -SR20, wherein R20 is a hydrocarbon group optionally having a substituent (substituents) selected from substituent group A, (7) a group represented by the formula -S (O) R21, wherein R21 is a hydrocarbon group optionally having a substituent (s) selected from substituent groups A, (8) a group represented by the formula -S (O) 2R22, wherein R22 is a hydrocarbon group optionally having a substituent (s) selected from substituted group A or (9) acyl; R4 and R5 are the same or different and each is (1) a hydrogen atom, (2) a hydrocarbon group optionally having a substituent (substituents) selected from substituted group A, (3) hydroxy optionally having a hydrocarbon group optionally having a substituent (substituents) selected from substituted group A, ( 4) an amino optionally having 1 or 2 hydrocarbon groups optionally having a substituent (s) selected from a substituted group A, (5) a group represented by the formula - |