SynaptoRed C2M (also known as FM5-95, a trademark of Molecular Probes, Inc.) is a red fluorescent probe used to follow synaptic vesicles. SynaptoRed C2M is slightly more water soluble than SynaptoRed C2 (also known as FM4-64).
Flyer (PDF): Nerve Terminal Dyes
MSDS (PDF): MSDS 70028, MSDS 70019