In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Compound 7e , 5 - { 2 - [ 4 - ( 1 , 2 - dihydro - 2 - acenaphthylenyl ) piperazinyl ] ethyl } - 2 , 3 - dihy dro - 1H - indol - 2 - one , from this series showed significant affinities at the 5 - HT1A and 5 - HT2A receptors and moderate affinity at the D2 receptor .
### Output Text:
Compound 7e , <span class="chemical">5 - { 2 - [ 4 - ( 1 , 2 - dihydro - 2 - acenaphthylenyl ) piperazinyl ] ethyl } - 2 , 3 - dihy dro - 1H - indol - 2 - one</span> , from this series showed significant affinities at the 5 - HT1A and 5 - HT2A receptors and moderate affinity at the D2 receptor . 