This invention provides compounds having excellent antitumor activity, which are represented by the following formulae
in which R
1
, R
2
, R
3
, m, n and R
4
have the significations as given in the specification.
This invention provides compounds having excellent antitumor activity, which are represented by the following formulae
in which R
1
, R
2
, R
3
, m, n and R
4
have the significations as given in the specification.
This invention provides compounds having excellent antitumor activity which are represented by the following formula (I-4):
in which R4 stands for -CH2OH or -CH3.