A compound (including salts thereof) according to Formula I
in which
R1 is H, methyl or ethyl;
R2 is H, OH, fluorine, C1-C4 linear or branched alkyl, C1-C6 alkoxy wherein the alkyl group is linear or branched, or a C3-C5 cycloalkyl moiety;
R3 is H, methoxy, methyl or ethyl;
or R2 and R3 together form a bridging moiety —O—CH2—O— between the phenyl carbon atoms to which they are connected;
R4 is OH or methoxy; and
R5 and R6 are independently H or methyl;
R1, R2, R3, R4, R5 and R6 are such that,
(i) when R2 and R3 together form a bridging moiety —O—CH2—O— between the phenyl carbon atoms to which they are connected, R1, R5, R6 are H, and R4 is OH; and
(ii) when R4 is OH and R1-R3 are H, at least one of R5, R6 is methyl.
根据公式I,其中R1为H、甲基或乙基;R2为H、羟基、
氟、C1-C4线性或支链烷基、C1-C6烷氧基(其中烷基为线性或支链)或C3-C5环烷基;R3为H、甲氧基、甲基或乙基;或R2和R3共同形成桥连基-O-
CH2-O-,位于它们连接的苯基碳原子之间;R4为羟基或甲氧基;R5和R6独立地为H或甲基;R1、R2、R3、R4、R5和R6满足以下条件:(i)当R2和R3共同形成桥连基-O- -O-,位于它们连接的苯基碳原子之间时,R1、R5、R6为H,R4为羟基;(ii)当R4为羟基且R1-R3为H时,至少有一个R5、R6为甲基。