Cell division inhibitor and a production method thereof

A compound of formula (I) or pharmaceutically acceptable salt thereof:

• wherein:
• each of X1 and X2 is independently oxygen or sulfur;
• Y3 is oxygen, sulfur, —NR3—, or —CR31R32—;
• Y4 is oxygen, sulfur, —NR4—, or —CR41R42—;
• R10 is an aryl or aralkyl and is optionally substituted with other substituent(s) and optionally comprises one or more heteroatoms;
• R20 is an aryl or aralkyl and is optionally substituted with other substituent(s) and optionally comprises one or more heteroatoms, with the proviso that R20 does not include a phenyl group;
• each of R3 and R4 is independently selected from the group consisting of hydrogen, halogen, C1-25 alkyl, C2-25 alkenyl, C2-25 alkynyl, C1-25 alkoxy, aralkyl, hydroxyl, amino, nitro, and aryl, each of which is optionally substituted with other substituent(s), wherein any part of a carbon chain in R3 and R4 may be branched or cyclized, and may comprise one or more heteroatoms;
• each of R31, R32, R41, and R42 is independently selected from the group consisting of hydrogen, halogen, C1-25 alkyl, C2-25 alkenyl, C2-25 alkynyl, C1-25 alkoxy, aralkyl, hydroxyl, amino, nitro, and aryl, each of which is optionally substituted with other substituent(s), wherein any part of a carbon chain in R31, R32, R41, and R42 may be branched or cyclized, and may comprise one or more heteroatoms;
• R10 and any of R3, R31, or R32 may together from a ring;
• R20 and any of R4, R41, or R42 may together from a ring;
• each bond depicted by a solid line and dashed line represents a carbon-carbon single bond or a carbon-carbon double bond with E or Z configurations;
• and
• at least one of said groups may have a protecting group capable of decomposing in vivo;
• with the proviso that the compound of formula I does not include the compound having the following structure: