| abstract |
Provided is a new therapeutic agent for a malignant tumor, which is highly safe, sustains an antitumor effect, and can improve the means for administration and the number of times of administration. Disclosed is a compound of Formula (1), or a salt thereof: n C[CH 2 O(CH 2 CH 2 O) n CH 2 CO—R 1 —R 2 ] 4 (1)n wherein R 1 represents a single bond, —N(R 3 )(CH 2 ) n1 CO—, or —N(R 4 )(CH 2 ) n2 N (R 5 )CO(CH 2 ) n3 CO—; R 2 represents a group of Formula (a), (b), (c), (d), (e), or (f): nn n n n n n n n n n n n n n n n n n n m represents a number of from 10 to 1,000; and n an arrow represents a bonding site. |